Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
U.S. offices
Noninterest-bearing	$ 383,282	$ 392,721
Interest-bearing:
Demand	133,769	84,088
Savings	510,544	486,043
Time (included $10,575 and $10,916 at fair value)	51,354	92,873
Total interest-bearing deposits	695,667	663,004
Total deposits in U.S. offices	1,078,949	1,055,725
Non-U.S. offices
Noninterest-bearing	20,913	18,921
Interest-bearing:
Demand	167,025	154,773
Savings	1,329	2,157
Time (included $1,444 and $1,600 at fair value)	53,600	48,139
Total interest-bearing deposits	221,954	205,069
Total deposits in non-U.S. offices	242,867	223,990
Total deposits	1,321,816	1,279,715
Fair value
Interest-bearing:
Time (included $10,575 and $10,916 at fair value)	10,575	10,916
Interest-bearing:
Time (included $1,444 and $1,600 at fair value)	$ 1,444	$ 1,600