| Current Federal Tax Expense (Benefit) | 1.05B | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 115.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 1.17B | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | -168.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 43.00M | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Amortization | 936.00M | 2025-01-01 → 2025-12-31 |
| Loans Receivable, Fair Value Disclosure | 11.00M | as of 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | 884.00M | 2025-01-01 → 2025-12-31 |
| State and Local Income Tax Expense (Benefit), Continuing Operations | 158.00M | 2025-01-01 → 2025-12-31 |
| Loans Held-for-sale, Fair Value Disclosure | 1.62B | as of 2025-12-31 |
| Other Assets, Fair Value Disclosure | 1.73B | as of 2025-12-31 |
| Dividends, Preferred Stock, Cash | 324.00M | 2025-01-01 → 2025-12-31 |
| Dividends, Preferred Stock | 324.00M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Trading, and Equity Securities, FV-NI | 5.79B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 3.12B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | -1.78B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 1.33B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 126.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 75.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | 33.00M | 2025-01-01 → 2025-12-31 |
| Securities Purchased under Agreements to Resell, Gross | 1.31B | as of 2025-12-31 |
| Short-term Debt, Fair Value | 2.39B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 127.00M | 2025-01-01 → 2025-12-31 |
| SecurityPurchasedUnderAgreementToResellAfterOffsetSubjectToMasterNettingArrangement | 12.00M | as of 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationTaxCreditEnergyRelatedAmount | 111.00M | 2025-01-01 → 2025-12-31 |
| Preferred Stock, Including Additional Paid in Capital, Net of Discount | 4.92B | as of 2025-12-31 |
| Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities | 1.22B | as of 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 258.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 1.00M | 2025-01-01 → 2025-12-31 |
| Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash | 78.00M | as of 2025-12-31 |
| Fair Value of Securities Received as Collateral that Can be Resold or Repledged | 3.10B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | 66.00M | 2025-01-01 → 2025-12-31 |
| Securities Borrowed, Gross | 1.89B | as of 2025-12-31 |
| SecurityBorrowedAfterOffsetSubjectToMasterNettingArrangement | 52.00M | as of 2025-12-31 |
| Securities Borrowed, Collateral, Obligation to Return Securities | 1.83B | as of 2025-12-31 |
| Securities Borrowed, Collateral, Obligation to Return Cash | 0 | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | -7.00M | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock, Cash | 2.67B | 2025-01-01 → 2025-12-31 |
| Time Deposits, at or Above FDIC Insurance Limit | 11.01B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount | 204.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 252.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 222.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 196.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 170.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 80.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, after Year Five | 336.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 4.74B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 7.64B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 872.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 56.05B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Liability | 1.58B | as of 2025-12-31 |
| Interest-bearing Domestic Deposit, Brokered | 639.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 1.34B | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Asset | 1.58B | as of 2025-12-31 |
| Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 1.72B | as of 2025-12-31 |
| Defined Benefit Plan, Service Cost | 272.00M | 2025-01-01 → 2025-12-31 |
| Defined Benefit Plan, Interest Cost | 457.00M | 2025-01-01 → 2025-12-31 |
| Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 971.00M | 2025-01-01 → 2025-12-31 |
| Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic | 4.97B | 2025-01-01 → 2025-12-31 |
| Derivative, Notional Amount | 493.99B | as of 2025-12-31 |
| Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic | 0 | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 4.76B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 7.71B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 871.00M | as of 2025-12-31 |
| Defined Benefit Plan, Amortization of Gain (Loss) | 0 | 2025-01-01 → 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 4.62B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 51.70B | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 2.82B | as of 2025-12-31 |
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | -242.00M | 2025-01-01 → 2025-12-31 |
| Deferred Credits and Other Liabilities | 509.00M | as of 2025-12-31 |
| Defined Benefit Plan, Plan Assets, Amount | 14.28B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 37.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4.61B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4.65B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 390.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4.65B | as of 2025-12-31 |
| Time Deposit Maturities, Year One | 35.44B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax | -4.34B | as of 2025-12-31 |
| Time Deposit Maturities, Year Two | 1.55B | as of 2025-12-31 |
| Time Deposit Maturities, Year Three | 845.00M | as of 2025-12-31 |
| Time Deposit Maturities, Year Four | 175.00M | as of 2025-12-31 |
| Time Deposit Maturities, Year Five | 417.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4.04B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 27.78B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position | 31.82B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards | 599.00M | as of 2025-12-31 |
| Financing Receivable, Allowance for Credit Loss, Writeoff | 2.11B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Research | 209.00M | as of 2025-12-31 |
| Stock Repurchased During Period, Value | 2.52B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 753.00M | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Derivative, Cumulative Gain (Loss) | 335.00M | as of 2025-12-31 |
| Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables | 30.00M | as of 2025-12-31 |
| Operating Lease, Cost | 279.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses | 1.20B | as of 2025-12-31 |
| Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | -341.00M | 2025-01-01 → 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | 270.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 3.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 3.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 3.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 2.00M | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | 302.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 2.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 7.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 20.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 233.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Other | 14.00M | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 4.00M | as of 2025-12-31 |
| Financing Receivable, Troubled Debt Restructuring, Postmodification | 4.73B | 2025-01-01 → 2025-12-31 |
| Financing Receivable, Troubled Debt Restructuring | 3.94B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 267.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 276.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 214.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 166.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other Comprehensive Loss | 1.80B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 128.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 424.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 1.48B | as of 2025-12-31 |
| Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax | -583.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestModifiedPeriod | 141.00M | 2025-01-01 → 2025-12-31 |
| Derivative, Collateral, Right to Reclaim Securities | 77.00M | as of 2025-12-31 |
| Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 1.23B | as of 2025-12-31 |
| Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 542.00M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 5.13B | as of 2025-12-31 |
| Derivative, Collateral, Obligation to Return Securities | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 106.00M | as of 2025-12-31 |
| Derivative Asset, Collateral, Obligation to Return Cash, Offset | 194.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 5.02B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 199.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 3.52B | as of 2025-12-31 |
| Deferred Tax Assets, Net | 1.51B | as of 2025-12-31 |
| Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 344.00M | 2025-01-01 → 2025-12-31 |
| Property Subject to or Available for Operating Lease, Accumulated Depreciation | 527.00M | as of 2025-12-31 |
| Property Subject to or Available for Operating Lease, Net | 1.31B | as of 2025-12-31 |
| Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement | 1.59B | as of 2025-12-31 |
| Deferred Tax Liabilities, Prepaid Expenses | 2.01B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 78.16B | as of 2025-12-31 |
| Deferred Tax Liabilities, Mortgage Servicing Rights | 329.00M | as of 2025-12-31 |
| Other Liabilities, Fair Value Disclosure | 1.80B | as of 2025-12-31 |
| Deferred Tax Liabilities, Leasing Arrangements | 232.00M | as of 2025-12-31 |
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | 4.83B | as of 2025-12-31 |
| Deferred Tax Liabilities, Intangible Assets | 392.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 207.00M | as of 2025-12-31 |
| HedgedAssetFairValueHedgePortfolioLayerMethodCumulativeIncreaseDecreaseExcludedFromAmortizedCost | 77.00M | as of 2025-12-31 |
| Prepayable Financial Asset Closed Portfolio, Last-of-Layer, Amortized Cost | 27.40B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 4.73B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 150.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 11.64B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 3.09B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 6.87B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 3.45B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 12.19B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | as of 2025-12-31 |
| Unrecognized Tax Benefits | 81.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 2.00M | 2025-01-01 → 2025-12-31 |
| Direct Financing Lease, Lease Receivable | 14.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 7.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 9.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 5.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 9.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 16.00M | as of 2025-12-31 |
| Financing Receivable, Held-for-Sale | 1.88B | as of 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 65.00M | as of 2025-12-31 |
| Other Comprehensive Income, Other, Net of Tax | 6.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear | 83.78B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear | 31.48B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear | 21.02B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear | 38.56B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear | 28.19B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear | 40.09B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestRevolving | 82.67B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan | 3.12B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff | 179.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff | 378.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff | 366.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff | 311.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff | 122.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff | 240.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestRevolvingWriteoff | 497.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff | 15.00M | 2025-01-01 → 2025-12-31 |
| Financing Receivable, Nonaccrual | 1.58B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance | 12.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Amortized Cost | 69.30B | as of 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess | 328.60B | as of 2025-12-31 |
| Mortgage Loans in Process of Foreclosure, Amount | 247.00M | as of 2025-12-31 |
| APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 317.00M | 2025-01-01 → 2025-12-31 |