Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S. offices
Noninterest-bearing (included $9,873 and $22,637 at fair value)	$ 572,711	$ 395,667
Interest-bearing (included $2,567 and $2,534 at fair value)	1,197,032	876,156
Total deposits in U.S. offices	1,769,743	1,271,823
Non-U.S. offices
Noninterest-bearing (included $1,486 and $1,980 at fair value)	23,435	20,087
Interest-bearing (included $558 and $1,438 at fair value)	351,079	270,521
Total deposits in non-U.S. offices	374,514	290,608
Total deposits	2,144,257	1,562,431
Fair value
U.S. offices
Noninterest-bearing (included $9,873 and $22,637 at fair value)	9,873	22,637
Interest-bearing, fair value	2,567	2,534
Non-U.S. offices
Noninterest-bearing (included $1,486 and $1,980 at fair value)	1,486	1,980
Interest-bearing, fair value	$ 558	$ 1,438