Deposits - Types and Sources of the Firm's Deposits (Parenthetical) (Detail) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2020
USD ($)
Arrangements
|
Dec. 31, 2019
USD ($)
|
|
| Deposits [Abstract] | ||
| Deposits at fair value | $ 16,176 | $ 17,765 |
| Weighted average maturity of time deposits | 1 year 3 months 18 days | 1 year 8 months 12 days |
| Number of deposit sweep program contractual arrangements | Arrangements | 12 | |
| Deposits insured by the FDIC | $ 123,030 | $ 103,980 |
| Deposits insured by non-U.S. Insurance Programs | $ 27,520 | $ 15,860 |