Derivative Instruments - Credit Derivatives (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Credit Derivatives - supplemental information
Tranche credit default swap realized credit loss protection	$ 1
Tranche credit default swap portfolio of exposure	10
Total credit derivatives and credit-related notes
Protection sold	(2,100,303)	(2,645,848)
Protection purchased with identical underlyings	2,110,144	2,656,119
Net protection (sold)/purchased	9,841	10,271
Other protection purchased	41,810	31,922
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(2,100,263)	(2,645,718)
Protection purchased with identical underlyings	2,110,144	2,656,119
Net protection (sold)/purchased	9,881	10,401
Other protection purchased	38,106	29,202
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(2,056,982)	(2,601,581)
Protection purchased with identical underlyings	2,078,096	2,610,198
Net protection (sold)/purchased	21,114	8,617
Other protection purchased	18,631	8,722
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(43,281)	(44,137)
Protection purchased with identical underlyings	32,048	45,921
Net protection (sold)/purchased	(11,233)	1,784
Other protection purchased	19,475	20,480
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	(40)	(130)
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	(40)	(130)
Other protection purchased	$ 3,704	$ 2,720