Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
U.S. offices
Noninterest-bearing (included $9,436 and $9,873 at fair value)	$ 629,139	$ 572,711
Interest-bearing (included $2,579 and $2,567 at fair value)	1,266,856	1,197,032
Total deposits in U.S. offices	1,895,995	1,769,743
Non-U.S. offices
Noninterest-bearing (included $1,761 and $1,486 at fair value)	22,661	23,435
Interest-bearing (included $331 and $558 at fair value)	359,456	351,079
Total deposits in non-U.S. offices	382,117	374,514
Total deposits	2,278,112	2,144,257
Fair value
U.S. offices
Noninterest-bearing (included $9,436 and $9,873 at fair value)	9,436	9,873
Interest-bearing, fair value	2,579	2,567
Non-U.S. offices
Noninterest-bearing (included $1,761 and $1,486 at fair value)	1,761	1,486
Interest-bearing, fair value	$ 331	$ 558