Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
U.S. offices
Noninterest-bearing (included $26,673 and $17,204 at fair value)	$ 394,237	$ 386,709
Interest-bearing (included $2,530 and $2,487 at fair value)	841,397	813,881
Total deposits in U.S. offices	1,235,634	1,200,590
Non-U.S. offices
Noninterest-bearing (included $2,445 and $2,367 at fair value)	20,419	21,459
Interest-bearing (included $1,276 and $1,159 at fair value)	268,308	248,617
Total deposits in non-U.S. offices	288,727	270,076
Total deposits	1,524,361	1,470,666
Fair value
U.S. offices
Noninterest-bearing (included $26,673 and $17,204 at fair value)	26,673	17,204
Interest-bearing, fair value	2,530	2,487
Non-U.S. offices
Noninterest-bearing (included $2,445 and $2,367 at fair value)	2,445	2,367
Interest-bearing, fair value	$ 1,276	$ 1,159