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Fair Value Option - Components of Gain (Loss) on Instruments at Fair Value and Related Derivatives (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Mark-to-market on related derivatives $ 367 $ (1,354)
Gain (loss) on instruments designated at fair value and related derivatives 18 (22)
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components [1] (352) 1,445
Credit risk component, total [2] 1 (54) [3]
Total mark-to-market on financial instruments designated at fair value (351) 1,391
Mark-to-market on related derivatives 360 (1,419)
Net realized gain on related long-term debt derivatives 9 6
Gain (loss) on instruments designated at fair value and related derivatives 18 (22)
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Loans [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components [1] 0 0
Credit risk component, assets [2] 1 (54) [3]
Total mark-to-market on financial instruments designated at fair value 1 (54)
Mark-to-market on related derivatives 0 37
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives 1 (17)
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Long-term debt [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components [1] 100 (134)
Credit risk component, liabilities [2] 0 0 [3]
Total mark-to-market on financial instruments designated at fair value 100 (134)
Mark-to-market on related derivatives (108) 150
Net realized gain on related long-term debt derivatives 9 6
Gain (loss) on instruments designated at fair value and related derivatives 1 22
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Hybrid Instrument [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components [1] (452) 1,579
Credit risk component, liabilities [2] 0 0 [3]
Total mark-to-market on financial instruments designated at fair value (452) 1,579
Mark-to-market on related derivatives 468 (1,606)
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives $ 16 $ (27)
[1] As it relates to hybrid instruments, interest rate and other components primarily includes interest rate, foreign exchange and equity contract risks.
[2] The fair value movement on fair value option liabilities attributable to our own credit spread is recorded in other comprehensive income.
[3] During the three months ended March 31, 2020, the loss in the credit risk component for loans and loans held for sale was attributable to the widening of credit spreads associated with certain commercial loans held for sale which were impacted by the COVID-19 pandemic.