Deposits - Noninterest and Interest-bearing (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
U.S. offices:
Noninterest-bearing	$ 343,299	$ 346,670
Interest-bearing
Demand	46,400	47,075
Savings	384,239	375,051
Time (included $3,861 and $2,733 at fair value)	90,684	82,738
Total interest-bearing deposits	521,323	504,864
Total deposits in U.S. offices	864,622	851,534
Non-U.S. offices:
Noninterest-bearing	16,276	18,790
Interest-bearing
Demand	187,676	188,202
Savings	899	687
Time (included $1,072 and $1,636 at fair value)	59,039	68,593
Total interest-bearing deposits	247,614	257,482
Total deposits in non-U.S. offices	263,890	276,272
Total deposits	1,128,512	1,127,806
Fair value
Interest-bearing
Time (included $3,861 and $2,733 at fair value)	4,192	3,861
Interest-bearing
Time (included $1,072 and $1,636 at fair value)	$ 1,076	$ 1,072