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Income Taxes - Reconciliation of Income Tax Expense with Expected Federal Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
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.