Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
U.S. offices
Noninterest-bearing (included $9,186 and $9,873 at fair value)	$ 656,438	$ 572,711
Interest-bearing (included $630 and $2,567 at fair value)	1,344,092	1,197,032
Total deposits in U.S. offices	2,000,530	1,769,743
Non-U.S. offices
Noninterest-bearing (included $1,788 and $1,486 at fair value)	28,589	23,435
Interest-bearing (included $204 and $558 at fair value)	373,234	351,079
Total deposits in non-U.S. offices	401,823	374,514
Total deposits	2,402,353	2,144,257
Fair value
U.S. offices
Noninterest-bearing (included $9,186 and $9,873 at fair value)	9,186	9,873
Interest-bearing, fair value	630	2,567
Non-U.S. offices
Noninterest-bearing (included $1,788 and $1,486 at fair value)	1,788	1,486
Interest-bearing, fair value	$ 204	$ 558