Derivatives and Hedging Activities - Summary of Information About CVA and FVA (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| CVA, net of hedges | $ 49 | $ 103 | $ (14) | $ 52 |
| FVA, net of hedges | 17 | 101 | 54 | (78) |
| Total | $ 66 | $ 204 | $ 40 | $ (26) |