Deposits - Noninterest and Interest-bearing (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
U.S. offices:
Noninterest-bearing	$ 363,388	$ 346,670
Interest-bearing
Demand	41,634	47,075
Savings	386,472	375,051
Time (included $4,686 and $3,861 at fair value)	81,301	82,738
Total interest-bearing deposits	509,407	504,864
Total deposits in U.S. offices	872,795	851,534
Non-U.S. offices:
Noninterest-bearing	16,192	18,790
Interest-bearing
Demand	196,303	188,202
Savings	933	687
Time (included $764 and $1,072 at fair value)	53,388	68,593
Total interest-bearing deposits	250,624	257,482
Total deposits in non-U.S. offices	266,816	276,272
Total deposits	1,139,611	1,127,806
Fair value
Interest-bearing
Time (included $4,686 and $3,861 at fair value)	4,686	3,861
Interest-bearing
Time (included $764 and $1,072 at fair value)	$ 764	$ 1,072