Derivative Instruments - Credit Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Total credit derivatives and credit-related notes
Protection sold	$ (1,815,987)	$ (2,100,303)
Protection purchased with identical underlyings	1,831,673	2,110,144
Net protection (sold)/purchased	15,686	9,841
Other protection purchased	37,560	41,810
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(1,815,957)	(2,100,263)
Protection purchased with identical underlyings	1,831,673	2,110,144
Net protection (sold)/purchased	15,716	9,881
Other protection purchased	33,152	38,106
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(1,768,492)	(2,056,982)
Protection purchased with identical underlyings	1,789,168	2,078,096
Net protection (sold)/purchased	20,676	21,114
Other protection purchased	15,001	18,631
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(47,465)	(43,281)
Protection purchased with identical underlyings	42,505	32,048
Net protection (sold)/purchased	(4,960)	(11,233)
Other protection purchased	18,151	19,475
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	(30)	(40)
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	(30)	(40)
Other protection purchased	$ 4,408	$ 3,704