Deposits - Noninterest and Interest-bearing (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
U.S. offices:
Noninterest-bearing	$ 440,067	$ 389,863
Interest-bearing:
Demand	83,240	84,631
Savings	455,454	450,405
Time (included $7,497 and $5,995 at fair value)	80,901	91,356
Total interest-bearing deposits	619,595	626,392
Total deposits in U.S. offices	1,059,662	1,016,255
Non-U.S. offices
Noninterest-bearing	19,134	17,611
Interest-bearing:
Demand	217,106	214,391
Savings	1,734	1,083
Time (included $925 and $629 at fair value)	36,898	38,425
Total interest-bearing deposits	255,738	253,899
Total deposits in non-U.S. offices	274,872	271,510
Total deposits	1,334,534	1,287,765
Fair Value
Interest-bearing:
Time (included $7,497 and $5,995 at fair value)	7,497	5,995
Interest-bearing:
Time (included $925 and $629 at fair value)	$ 925	$ 629