Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
U.S. offices
Noninterest-bearing (included $23,225 and $17,204 at fair value)	$ 393,522	$ 386,709
Interest-bearing (included $2,523 and $2,487 at fair value)	844,137	813,881
Total deposits in U.S. offices	1,237,659	1,200,590
Non-U.S. offices
Noninterest-bearing (included $2,289 and $2,367 at fair value)	21,455	21,459
Interest-bearing (included $1,318 and $1,159 at fair value)	266,147	248,617
Total deposits in non-U.S. offices	287,602	270,076
Total deposits	1,525,261	1,470,666
Fair value
U.S. offices
Noninterest-bearing (included $23,225 and $17,204 at fair value)	23,225	17,204
Interest-bearing, fair value	2,523	2,487
Non-U.S. offices
Noninterest-bearing (included $2,289 and $2,367 at fair value)	2,289	2,367
Interest-bearing, fair value	$ 1,318	$ 1,159