Derivatives and Hedging Activities - Summary of Information About CVA and FVA (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| CVA, net of hedges | $ 45 | $ (322) | $ (63) | $ (51) |
| FVA, net of hedges | 25 | 580 | 37 | (179) |
| Total | $ 70 | $ 258 | $ (26) | $ (230) |