Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
U.S. offices
Noninterest-bearing	$ 432,052	$ 437,558
Interest-bearing:
Demand	69,477	90,319
Savings	462,554	466,730
Time (included $9,364 and $7,501 at fair value)	79,407	86,301
Total interest-bearing deposits	611,438	643,350
Total deposits in U.S. offices	1,043,490	1,080,908
Non-U.S. offices
Noninterest-bearing	21,777	19,078
Interest-bearing
Demand	177,923	217,011
Savings	1,873	2,673
Time (included $2,121 and $1,306 at fair value)	42,269	43,757
Total interest-bearing deposits	222,065	263,441
Total deposits in non-U.S. offices	243,842	282,519
Total deposits	1,287,332	1,363,427
Estimate of Fair Value
Interest-bearing:
Time (included $9,364 and $7,501 at fair value)	9,364	7,501
Interest-bearing
Time (included $2,121 and $1,306 at fair value)	$ 2,121	$ 1,306