v3.25.2
Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance $ 338 $ 711 $ 363 $ 337
Realized and Unrealized Gains (Losses),Assets 11 3 1 (3)
Purchases, Assets 5 74 20 471
Sales and Maturities, Assets (19) (337) (49) (354)
Issuances and other Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 6 0 9
Transfers out of Level 3, Assets 0 0 0 (3)
Assets measured at fair value, ending balance 335 457 335 457
Total Net Unrealized Gains (Losses) Included in Earnings 11 3 1 (3)
Liabilities measured at fair value, beginning balance 4,492   4,431  
Realized and Unrealized Gains (Losses), Liabilities 82   178  
Purchases, Liabilities 0   0  
Sales and Maturities, Liabilities 0   0  
Issuances and other Settlements, Liabilities (5)   (40)  
Transfers into Level 3, Liabilities 0   0  
Transfers out of Level 3, Liabilities 0   0  
Liabilities measured at fair value, ending balance 4,569   4,569  
Total Net Unrealized Gains (Losses) Included in Earnings 82   178  
Other Assets [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance 152 138 149 120
Assets measured at fair value, ending balance 164 150 164 150
Other Liabilities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities measured at fair value, beginning balance 102 258 129 279
Liabilities measured at fair value, ending balance 97 298 97 298
Investments [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance 186 573 214 217
Realized and Unrealized Gains (Losses),Assets (1) 3 (14) 4
Purchases, Assets 5 62 20 434
Sales and Maturities, Assets (19) (337) (49) (354)
Issuances and other Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 6 0 9
Transfers out of Level 3, Assets 0 0 0 (3)
Assets measured at fair value, ending balance 171 307 171 307
Total Net Unrealized Gains (Losses) Included in Earnings (1) 3 (14) 4
Contingent Consideration Liabilities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities measured at fair value, beginning balance 4,390   4,302  
Realized and Unrealized Gains (Losses), Liabilities 82   181  
Purchases, Liabilities 0   0  
Sales and Maturities, Liabilities 0   0  
Issuances and other Settlements, Liabilities 0   (11)  
Transfers into Level 3, Liabilities 0   0  
Transfers out of Level 3, Liabilities 0   0  
Liabilities measured at fair value, ending balance 4,472   4,472  
Total Net Unrealized Gains (Losses) Included in Earnings $ 82   $ 181  
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  
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 $ 79 48 $ 79 42
Realized and Unrealized Gains (Losses),Assets (3) 5 (5) 4
Purchases, Assets 1 29 5 36
Sales and Maturities, Assets (1) 0 (3) 0
Issuances and other Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets (1) 0 (1) 0
Assets measured at fair value, ending balance 75 82 75 82
Total Net Unrealized Gains (Losses) Included in Earnings $ (3) $ 5 $ (5) $ 4
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense)
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 $ 107 $ 525 $ 135 $ 175
Realized and Unrealized Gains (Losses),Assets 2 (2) (9) 0
Purchases, Assets 4 33 15 398
Sales and Maturities, Assets (18) (337) (46) (354)
Issuances and other Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 6 0 9
Transfers out of Level 3, Assets 1 0 (1) (3)
Assets measured at fair value, ending balance 96 225 96 225
Total Net Unrealized Gains (Losses) Included in Earnings 2 (2) (9) 0
Other Assets One [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Realized and Unrealized Gains (Losses),Assets 12 0 15 (7)
Purchases, Assets 0 12 0 37
Sales and Maturities, Assets 0 0 0 0
Issuances and other Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Total Net Unrealized Gains (Losses) Included in Earnings 12 0 15 (7)
Other Liabilities One [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Realized and Unrealized Gains (Losses), Liabilities 0 3 (3) (3)
Purchases, Liabilities 0 0 0 0
Sales and Maturities, Liabilities 0 0 0 0
Issuances and other Settlements, Liabilities (5) 37 (29) 22
Transfers into Level 3, Liabilities 0 0 0 0
Transfers out of Level 3, Liabilities 0 0 0 0
Total Net Unrealized Gains (Losses) Included in Earnings $ 0 $ 3 $ (3) $ (3)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense)