| Current Federal, State and Local, Tax Expense (Benefit) | 49.00M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 383.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 432.00M | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Amortization | 504.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal, State and Local, Tax Expense (Benefit) | -132.00M | 2025-01-01 → 2025-12-31 |
| Deferred Foreign Income Tax Expense (Benefit) | -48.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 93.00M | as of 2025-12-31 |
| Accrued Professional Fees, Current | 96.00M | as of 2025-12-31 |
| Other Accrued Liabilities, Current | 424.00M | as of 2025-12-31 |
| SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) | 10.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 334.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 43.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | 23.00M | 2025-01-01 → 2025-12-31 |
| Restructuring Reserve, Current | 31.00M | as of 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationFdiiAmount | 57.00M | 2025-01-01 → 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationCrossBorderOtherAmount | -56.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 262.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 11.00M | 2025-01-01 → 2025-12-31 |
| Accounts Payable and Other Accrued Liabilities, Current | 3.75B | as of 2025-12-31 |
| Common Stocks, Including Additional Paid in Capital | 11.38B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | -3.00M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 976.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 850.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 706.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 562.00M | as of 2025-12-31 |
| Revenue, Remaining Performance Obligation, Amount | 34.20B | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 411.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | as of 2025-12-31 |
| Treasury Stock, Value, Acquired, Cost Method | 1.25B | 2025-01-01 → 2025-12-31 |
| Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 367.00M | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards | 193.00M | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 4.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | -8.00M | 2025-01-01 → 2025-12-31 |
| Goodwill, Acquired During Period | 1.28B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards | 230.00M | as of 2025-12-31 |
| Goodwill, Foreign Currency Translation Gain (Loss) | 627.00M | 2025-01-01 → 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | 4.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 169.00M | as of 2025-12-31 |
| Lease, Cost | 178.00M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 133.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 13.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 14.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 14.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 14.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 15.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 256.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 326.00M | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 108.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 107.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 82.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 59.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 38.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 26.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 51.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 363.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 85.00M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 1.14B | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 206.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 929.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 45.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 750.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net | 179.00M | as of 2025-12-31 |
| Long-term Debt, Gross | 15.80B | as of 2025-12-31 |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 8.00M | 2025-01-01 → 2025-12-31 |
| Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 34.00M | as of 2025-12-31 |
| AOCI Tax, Attributable to Parent | -186.00M | as of 2025-12-31 |
| OCI, before Reclassifications, Net of Tax, Attributable to Parent | 103.00M | 2025-01-01 → 2025-12-31 |
| Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 8.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Other | 106.00M | as of 2025-12-31 |
| Undistributed Earnings of Foreign Subsidiaries | 6.69B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 1.84B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 82.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 1.79B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 2.57B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 2.45B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 3.27B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 3.87B | as of 2025-12-31 |
| Derivatives used in Net Investment Hedge, Net of Tax | -394.00M | as of 2025-12-31 |
| Reclassification from AOCI, Current Period, Tax | 2.00M | 2025-01-01 → 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 76.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 154.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 5.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 4.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 15.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 3.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 7.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 136.00M | as of 2025-12-31 |
| Unbilled Contracts Receivable | 1.78B | as of 2025-12-31 |
| Billed Contracts Receivable | 1.67B | as of 2025-12-31 |
| Income Taxes Receivable, Current | 27.00M | as of 2025-12-31 |
| Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | -7.00M | as of 2025-12-31 |
| APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 227.00M | 2025-01-01 → 2025-12-31 |