Securitization Activities - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Assets securitized in a non-cash exchange for loans and investments | $ 886 | $ 551 | $ 601 |
| Net Asset related to Other Continuing Involvement | 81 | 52 | |
| Notional amount related to Other Continuing Involvement | 1,810 | 1,430 | |
| Fair Value of Retained Interests | 3,570 | 3,190 | |
| Other Retained Interests [Member] | |||
| Fair Value of Retained Interests | $ 360 | $ 192 | |
| Weighted average life (years) | 3 years 7 months 6 days | 3 years 10 months 24 days | |
| Maximum Exposure to Adverse Changes in the value of Other retained interests | $ 360 | $ 192 | |