Securitization Activities - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Dec. 31, 2020 |
|
| Assets securitized in a non-cash exchange for loans and investments | $ 274 | $ 129 | $ 413 | $ 303 | |
| Net Asset related to Other Continuing Involvement | 97 | 97 | $ 52 | ||
| Notional amount related to Other Continuing Involvement | 1,990 | 1,990 | 1,430 | ||
| Fair Value of Retained Interests | 3,880 | 3,880 | 3,190 | ||
| Other Retained Interests [Member] | |||||
| Fair Value of Retained Interests | 252 | $ 252 | $ 192 | ||
| Weighted average life (years) | 3 years 1 month 6 days | 3 years 10 months 24 days | |||
| Maximum Exposure to Adverse Changes in the value of Other retained interests | $ 252 | $ 252 | $ 192 | ||