Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
U.S. offices
Noninterest-bearing	$ 363,332	$ 369,505
Interest-bearing (included $27,792 and $19,691 at fair value)	851,963	831,085
Total deposits in U.S. offices	1,215,295	1,200,590
Non-U.S. offices
Noninterest-bearing	18,495	19,092
Interest-bearing (included $4,012 and $3,526 at fair value)	259,651	250,984
Total deposits in non-U.S. offices	278,146	270,076
Total deposits	1,493,441	1,470,666
Fair value
U.S. offices
Interest-bearing, fair value	27,792	19,691
Non-U.S. offices
Interest-bearing, fair value	$ 4,012	$ 3,526