Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
U.S. offices
Noninterest-bearing (included $9,565 and $9,873 at fair value)	$ 639,114	$ 572,711
Interest-bearing (included $2,627 and $2,567 at fair value)	1,281,432	1,197,032
Total deposits in U.S. offices	1,920,546	1,769,743
Non-U.S. offices
Noninterest-bearing (included $1,467 and $1,486 at fair value)	24,723	23,435
Interest-bearing (included $364 and $558 at fair value)	359,948	351,079
Total deposits in non-U.S. offices	384,671	374,514
Total deposits	2,305,217	2,144,257
Fair value
U.S. offices
Noninterest-bearing (included $9,565 and $9,873 at fair value)	9,565	9,873
Interest-bearing, fair value	2,627	2,567
Non-U.S. offices
Noninterest-bearing (included $1,467 and $1,486 at fair value)	1,467	1,486
Interest-bearing, fair value	$ 364	$ 558