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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, 2019
Mar. 31, 2018
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Mark-to-market on related derivatives $ 1,052 $ (507)
Gain (loss) on instruments designated at fair value and related derivatives (9) 30
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] (1,081) 529
Credit risk component, total [2] 3 4
Total mark-to-market on financial instruments designated at fair value (1,078) 533
Mark-to-market on related derivatives 1,059 (516)
Net realized gain on related long-term debt derivatives 10 13
Gain (loss) on instruments designated at fair value and related derivatives (9) 30
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] 3 4
Total mark-to-market on financial instruments designated at fair value 3 4
Mark-to-market on related derivatives 0 0
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives 3 4
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Securities purchased under resale agreements [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] 0 0
Total mark-to-market on financial instruments designated at fair value 0 0
Mark-to-market on related derivatives 0 0
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives 0 0
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Securities sold under repurchase agreements [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components [1] 0 (1)
Credit risk component, liabilities [2] 0 0
Total mark-to-market on financial instruments designated at fair value 0 (1)
Mark-to-market on related derivatives 0 0
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives 0 (1)
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] (69) 88
Credit risk component, liabilities [2] 0 0
Total mark-to-market on financial instruments designated at fair value (69) 88
Mark-to-market on related derivatives 53 (77)
Net realized gain on related long-term debt derivatives 10 13
Gain (loss) on instruments designated at fair value and related derivatives (6) 24
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] (1,012) 442
Credit risk component, liabilities [2] 0 0
Total mark-to-market on financial instruments designated at fair value (1,012) 442
Mark-to-market on related derivatives 1,006 (439)
Net realized gain on related long-term debt derivatives 0 0
Gain (loss) on instruments designated at fair value and related derivatives $ (6) $ 3
[1] As it relates to hybrid instruments, interest rate and other components primarily includes interest rate, foreign exchange and equity contract risks.
[2] he fair value movement on fair value option liabilities attributable to our own credit spread is recorded in other comprehensive income (loss).