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Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance $ 363 $ 337
Realized and Unrealized Gains (Losses),Assets (1) 2
Purchases, Assets 161 474
Sales and Maturities, Assets (145) (456)
Issuances and other Settlements, Assets 21 0
Transfers into Level 3, Assets 0 12
Transfers out of Level 3, Assets (32) (6)
Assets measured at fair value, ending balance 367 363
Total Net Unrealized Gains (Losses) Included in Earnings 8 2
Liabilities measured at fair value, beginning balance 4,431 279
Realized and Unrealized Gains (Losses), Liabilities 712 (35)
Purchases, Liabilities 0 0
Sales and Maturities, Liabilities 0 0
Issuances and other Settlements, Liabilities 3,286 4,187
Transfers into Level 3, Liabilities 0 0
Transfers out of Level 3, Liabilities 0 0
Liabilities measured at fair value, ending balance 8,429 4,431
Total Net Unrealized Gains (Losses) Included in Earnings 729 (35)
Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 149 120
Assets measured at fair value, ending balance 151 149
Other Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities measured at fair value, beginning balance 129 180
Liabilities measured at fair value, ending balance 0 129
Contingent consideration liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities measured at fair value, beginning balance 4,302 99
Realized and Unrealized Gains (Losses), Liabilities $ 729 $ (42)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Business Combination, Contingent Consideration, Liability, Current Business Combination, Contingent Consideration, Liability, Current
Purchases, Liabilities $ 0 $ 0
Sales and Maturities, Liabilities 0 0
Issuances and other Settlements, Liabilities 3,398 4,245
Transfers into Level 3, Liabilities 0 0
Transfers out of Level 3, Liabilities 0 0
Liabilities measured at fair value, ending balance 8,429 4,302
Total Net Unrealized Gains (Losses) Included in Earnings 729 (42)
Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 214 217
Realized and Unrealized Gains (Losses),Assets (19) 10
Purchases, Assets 161 437
Sales and Maturities, Assets (145) (456)
Issuances and other Settlements, Assets 21 0
Transfers into Level 3, Assets 0 12
Transfers out of Level 3, Assets (16) (6)
Assets measured at fair value, ending balance 216 214
Total Net Unrealized Gains (Losses) Included in Earnings (10) 10
Debt securities [Member] | Trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 7 42
Realized and Unrealized Gains (Losses),Assets 0 3
Purchases, Assets 0 35
Sales and Maturities, Assets 0 (1)
Issuances and other Settlements, Assets 0 0
Transfers into Level 3, Assets 0 0
Transfers out of Level 3, Assets 0 0
Assets measured at fair value, ending balance 7 7
Total Net Unrealized Gains (Losses) Included in Earnings $ 0 $ 3
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense) Nonoperating Income (Expense)
Debt securities [Member] | Trading [Member] | Previously Reported [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance $ 79  
Assets measured at fair value, ending balance   $ 79
Mutual Funds [Member] | Equity Securities Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 0  
Realized and Unrealized Gains (Losses),Assets 0  
Purchases, Assets 136  
Sales and Maturities, Assets 0  
Issuances and other Settlements, Assets 0  
Transfers into Level 3, Assets 0  
Transfers out of Level 3, Assets 0  
Assets measured at fair value, ending balance 136 0
Total Net Unrealized Gains (Losses) Included in Earnings 0  
Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 72  
Realized and Unrealized Gains (Losses),Assets (11)  
Purchases, Assets 10  
Sales and Maturities, Assets (3)  
Issuances and other Settlements, Assets 21  
Transfers into Level 3, Assets 0  
Transfers out of Level 3, Assets (16)  
Assets measured at fair value, ending balance 73 72
Total Net Unrealized Gains (Losses) Included in Earnings (10)  
Consolidated Variable Interest Entities [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value, beginning balance 135 175
Realized and Unrealized Gains (Losses),Assets (8) 7
Purchases, Assets 15 402
Sales and Maturities, Assets (142) (455)
Issuances and other Settlements, Assets 0 0
Transfers into Level 3, Assets 0 12
Transfers out of Level 3, Assets 0 (6)
Assets measured at fair value, ending balance 0 135
Total Net Unrealized Gains (Losses) Included in Earnings 0 7
Other Assets One [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Realized and Unrealized Gains (Losses),Assets 18 (8)
Purchases, Assets 0 37
Sales and Maturities, Assets 0 0
Issuances and other Settlements, Assets 0 0
Transfers into Level 3, Assets 0 0
Transfers out of Level 3, Assets (16) 0
Total Net Unrealized Gains (Losses) Included in Earnings 18 (8)
Other Liabilities One [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Realized and Unrealized Gains (Losses), Liabilities (17) 7
Purchases, Liabilities 0 0
Sales and Maturities, Liabilities 0 0
Issuances and other Settlements, Liabilities (112) (58)
Transfers into Level 3, Liabilities 0 0
Transfers out of Level 3, Liabilities 0 0
Total Net Unrealized Gains (Losses) Included in Earnings $ 0 $ 7
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense) Nonoperating Income (Expense)