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Income Taxes - Reconciliation of Income Tax Expense with Expected Federal Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory income tax expense, amount | $ 1,545 |  | $ 1,712 | $ 1,466
State and local income taxes, net of federal income tax effect, amount | 137 | [1] | 130 | 110
Impact of federal, foreign, state, and local tax rate changes on deferred taxes, amount |  |  | 12 | 0
Stock-based compensation awards, amount |  |  | (37) | (41)
Resolution of outstanding tax matters |  |  | 0 | (204)
Intellectual property reorganization, amount |  |  | (137) | 0
Foreign tax effects , amount |  |  | 84 | 112
Subpart F Income (net of FTC) , amount | 112 |  |  |
Global intangible low-taxed income (net of FTC), amount | 100 |  |  |
Base erosion and anti-abuse tax , amount | 106 |  |  |
Tax benefit from changes in organizational structure, amount | (366) |  |  |
Losses from foreign partnerships | (107) |  |  |
Other, Effect of cross-border tax laws, amount | (60) |  |  |
Tax credits, amount | (10) |  |  |
Nontaxable interest income, amount | (88) |  |  |
Nondeductible fair value adjustment on contingent consideration | 142 |  |  |
Nontaxable & nondeductible items , Other amount | 7 |  |  |
Changes in unrecognized tax benefits | (18) |  |  |
Valuation allowance from changes in organizational structure | 92 |  |  |
Other, amount |  |  | 19 | 36
Total income tax expense | $ 1,677 |  | $ 1,783 | $ 1,479
Statutory income tax expense, rate | 21.00% |  | 21.00% | 21.00%
State and local income taxes, net of federal income tax effect, rate | 2.00% | [1] | 2.00% | 2.00%
Impact of federal, foreign, state, and local tax rate changes on deferred taxes, rate |  |  | 0.00% | 0.00%
Stock-based compensation awards, rate |  |  | 0.00% | (1.00%)
Resolution of outstanding tax matters, rate |  |  | 0.00% | (3.00%)
Intellectual property reorganization, rate |  |  | (2.00%) | 0.00%
Foreign tax effects, rate |  |  | 1.00% | 2.00%
Other, rate |  |  | 0.00% | 0.00%
Subpart F Income (net of FTC), rate | 2.00% |  |  |
Global intangible low-taxed income (net of FTC), rate | 1.00% |  |  |
Base erosion and anti-abuse tax, rate | 1.00% |  |  |
Tax benefit from changes in organizational structure, rate | (5.00%) |  |  |
Losses from foreign partnerships, rate | (1.00%) |  |  |
Other, rate | (1.00%) |  |  |
Tax credits, rate | 0.00% |  |  |
Nontaxable interest income, rate | (1.00%) |  |  |
Nondeductible fair value adjustment on contingent consideration, rate | 2.00% |  |  |
Nontaxable & nondeductible items , Other rate | 0.00% |  |  |
Changes in unrecognized tax benefits, rate | 0.00% |  |  |
Valuation allowance from changes in organizational structure, rate | 1.00% |  |  |
Effective income tax rate | 23.00% |  | 22.00% | 21.00%
UNITED KINGDOM |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Foreign tax effects , amount | $ 79 |  |  |
Nontaxable income from Partnerships , amount | (169) |  |  |
Other, amount | $ 21 |  |  |
Foreign tax effects, rate | 1.00% |  |  |
Nontaxable income from partnership, rate | (2.00%) |  |  |
Other, rate | 0.00% |  |  |
Channel Islands |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Foreign tax effects , amount | $ 79 |  |  |
Other, amount | $ 1 |  |  |
Foreign tax effects, rate | 1.00% |  |  |
Other, rate | 0.00% |  |  |
Other foreign jurisdictions |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Foreign tax effects , amount | $ 56 |  |  |
Foreign tax effects, rate | 1.00% |  |  |
UNITED STATES |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Other, amount | $ 18 |  |  |
Other, rate | 0.00% |  |  |
[1] | State taxes in New York State, New York City and California make up the majority (greater than 50 percent) of the tax effect in this category.

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