Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
U.S. offices
Noninterest-bearing	$ 392,721	$ 437,558
Interest-bearing
Demand	84,088	90,319
Savings	486,043	466,730
Time (included $10,916 and $7,501 at fair value)	92,873	86,301
Total interest-bearing deposits	663,004	643,350
Total deposits in U.S. offices	1,055,725	1,080,908
Non-U.S. offices
Noninterest-bearing	18,921	19,078
Interest-bearing
Demand	154,773	217,011
Savings	2,157	2,673
Time (included $1,600 and $1,306 at fair value)	48,139	43,757
Total interest-bearing deposits	205,069	263,441
Total deposits in non-U.S. offices	223,990	282,519
Total deposits	1,279,715	1,363,427
Estimate of Fair Value
Interest-bearing
Time (included $10,916 and $7,501 at fair value)	10,916	7,501
Interest-bearing
Time (included $1,600 and $1,306 at fair value)	$ 1,600	$ 1,306