| Current State and Local Tax Expense (Benefit) | 598.00M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 1.66B | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 3.64B | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Accumulated Amortization | 3.83B | as of 2025-12-31 |
| Capitalized Computer Software, Net | 6.02B | as of 2025-12-31 |
| Cash and Cash Equivalents, Fair Value Disclosure | 24.36B | as of 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | -1.15B | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | -227.00M | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Amortization | 1.70B | 2025-01-01 → 2025-12-31 |
| Deferred Foreign Income Tax Expense (Benefit) | -376.00M | 2025-01-01 → 2025-12-31 |
| Loans Receivable, Fair Value Disclosure | 882.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 104.00M | 2025-01-01 → 2025-12-31 |
| Prepaid Expense and Other Assets, Current | 9.75B | as of 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | 1.38B | 2025-01-01 → 2025-12-31 |
| Investments, Fair Value Disclosure | 48.67B | as of 2025-12-31 |
| Property, Plant and Equipment, Other, Accumulated Depreciation | 3.72B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 3.09B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 151.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, after Tax | 865.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | -789.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Exercise of Option, Tax Benefit | 130.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 1.33B | as of 2025-12-31 |
| Business Combination, Consideration Transferred | 4.80B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | -547.00M | 2025-01-01 → 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 305.00M | as of 2025-12-31 |
| Equity Securities without Readily Determinable Fair Value, Amount | 3.30B | as of 2025-12-31 |
| Equity Securities, FV-NI and without Readily Determinable Fair Value | 5.50B | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 811.00M | as of 2025-12-31 |
| Noncontrolling Interest, Decrease from Deconsolidation | 2.60B | 2025-01-01 → 2025-12-31 |
| SegmentExpenditureAdditionToLongLivedAssets | 3.62B | 2025-01-01 → 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 525.00M | as of 2025-12-31 |
| Noncontrolling Interest, Change in Redemption Value | 117.00M | 2025-01-01 → 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 247.00M | as of 2025-12-31 |
| Deconsolidation, Gain (Loss), Amount | 1.70B | 2025-01-01 → 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 1.89B | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 536.00M | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 32.00M | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 355.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | -11.00M | 2025-01-01 → 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 923.00M | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 965.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 1.34B | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 1.26B | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 1.18B | as of 2025-12-31 |
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest | 4.83B | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 1.05B | as of 2025-12-31 |
| Revenue, Remaining Performance Obligation, Amount | 11.70B | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 926.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 3.86B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 13.78B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 11.96B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 6.95B | as of 2025-12-31 |
| Intangible Assets, Gross (Excluding Goodwill) | 27.95B | as of 2025-12-31 |
| Interest-bearing Domestic Deposit, Certificates of Deposits | 1.60B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 3.84B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 13.55B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 11.67B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 6.74B | as of 2025-12-31 |
| Impairment of Intangible Assets (Excluding Goodwill) | 0 | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 229.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1.63B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 566.00M | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 546.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 649.00M | 2025-01-01 → 2025-12-31 |
| Goodwill, Acquired During Period | 4.29B | 2025-01-01 → 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | 505.00M | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 3.00M | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2.00M | as of 2025-12-31 |
| Goodwill, Translation and Purchase Accounting Adjustments | -530.00M | 2025-01-01 → 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | 542.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 210.00M | as of 2025-12-31 |
| Operating Lease, Cost | 1.60B | 2025-01-01 → 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 266.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 202.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 5.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 17.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances | 1.28B | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 266.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 203.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 5.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 15.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 1.05B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 916.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 740.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 637.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 552.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 2.67B | as of 2025-12-31 |
| Deferred Tax Assets, Investments | 326.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 6.56B | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 4.58B | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 478.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 1.39B | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 6.53B | as of 2025-12-31 |
| Deferred Tax Assets, Net | 4.11B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 435.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Prepaid Expenses | 333.00M | as of 2025-12-31 |
| Debt, Long-term and Short-term, Combined Amount | 77.68B | as of 2025-12-31 |
| Deferred Tax Liabilities, Other Finite-Lived Assets | 4.35B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 75.60B | as of 2025-12-31 |
| Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | 402.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Leasing Arrangements | 800.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Deferred Expense, Capitalized Software | 152.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 2.42B | as of 2025-12-31 |
| Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | 800.00M | as of 2025-12-31 |
| Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount | 360.00M | 2025-01-01 → 2025-12-31 |
| Finite-lived Intangible Assets Acquired | 110.00M | 2025-01-01 → 2025-12-31 |
| Other Commitment | 4.80B | as of 2025-12-31 |
| Indefinite-lived Intangible Assets Acquired | 415.00M | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 26.70B | as of 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions | 32.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 6.08B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 850.00M | 2025-01-01 → 2025-12-31 |
| Current Year Claims and Claims Adjustment Expense | 313.46B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 3.53B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 3.60B | as of 2025-12-31 |
| Prior Year Claims and Claims Adjustment Expense | -140.00M | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 314.00B | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | 277.13B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 3.65B | as of 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | 31.29B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 3.85B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 58.66B | as of 2025-12-31 |
| Unrecognized Tax Benefits | 5.62B | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 583.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 6.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 926.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 5.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2.80B | as of 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic | 14.89B | 2025-01-01 → 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Foreign | -196.00M | 2025-01-01 → 2025-12-31 |
| Allowance for Doubtful Other Receivables, Current | 3.76B | as of 2025-12-31 |
| Other Receivables, Net, Current | 29.70B | as of 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Amortized Cost | 49.58B | as of 2025-12-31 |
| Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount | 3.00B | as of 2025-12-31 |
| Statutory Accounting Practices, Statutory Capital and Surplus Required | 23.20B | as of 2025-12-31 |
| Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 43.10B | as of 2025-12-31 |