Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Interest rate swaps | Non-interest income - other | |||
| Derivative [Line Items] | |||
| Derivative financial instrument, net | $ 0 | $ 0 | $ 0 |
| Interest rate lock commitments | Mortgage banking operations | |||
| Derivative [Line Items] | |||
| Derivative financial instrument, net | 0 | 0 | 0 |
| Forward delivery contracts | Mortgage banking operations | |||
| Derivative [Line Items] | |||
| Derivative financial instrument, net | 2 | (2) | (1) |
| Credit risk contracts | Non-interest income - other | |||
| Derivative [Line Items] | |||
| Derivative financial instrument, net | $ 0 | $ 0 | $ 0 |