Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
U.S. offices
Noninterest-bearing	$ 404,984	$ 437,558
Interest-bearing:
Demand	77,092	90,319
Savings	469,990	466,730
Time (included $9,497 and $7,501 at fair value)	76,932	86,301
Total interest-bearing deposits	624,014	643,350
Total deposits in U.S. offices	1,028,998	1,080,908
Non-U.S. offices
Noninterest-bearing	20,174	19,078
Interest-bearing:
Demand	171,290	217,011
Savings	1,742	2,673
Time (included $1,565 and $1,306 at fair value)	50,902	43,757
Total interest-bearing deposits	223,934	263,441
Total deposits in non-U.S. offices	244,108	282,519
Total deposits	1,273,106	1,363,427
Fair value
Interest-bearing:
Time (included $9,497 and $7,501 at fair value)	9,497	7,501
Interest-bearing:
Time (included $1,565 and $1,306 at fair value)	$ 1,565	$ 1,306