Derivative Instruments - Credit Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Total credit derivatives and credit-related notes
Protection sold	$ (1,542,725)	$ (1,428,839)
Protection purchased with identical underlyings	1,560,979	1,440,359
Net protection (sold)/purchased	18,254	11,520
Other protection purchased	39,161	35,518
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(1,542,689)	(1,428,809)
Protection purchased with identical underlyings	1,560,979	1,440,359
Net protection (sold)/purchased	18,290	11,550
Other protection purchased	33,485	30,803
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(1,511,148)	(1,386,071)
Protection purchased with identical underlyings	1,533,524	1,402,201
Net protection (sold)/purchased	22,376	16,130
Other protection purchased	13,409	12,011
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(31,541)	(42,738)
Protection purchased with identical underlyings	27,455	38,158
Net protection (sold)/purchased	(4,086)	(4,580)
Other protection purchased	20,076	18,792
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	(36)	(30)
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	(36)	(30)
Other protection purchased	$ 5,676	$ 4,715