Derivative Instruments - Credit Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Credit Derivatives - supplemental information
Tranche credit default swap realized credit loss protection	$ 1,000,000
Tranche credit default swap portfolio of exposure	10,000,000
Total credit derivatives and credit-related notes
Protection sold	(1,428,839,000,000)	$ (2,100,303,000,000)
Protection purchased with identical underlyings	1,440,359,000,000	2,110,144,000,000
Net protection (sold)/purchased	11,520,000,000	9,841,000,000
Other protection purchased	35,518,000,000	41,810,000,000
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(1,428,809,000,000)	(2,100,263,000,000)
Protection purchased with identical underlyings	1,440,359,000,000	2,110,144,000,000
Net protection (sold)/purchased	11,550,000,000	9,881,000,000
Other protection purchased	30,803,000,000	38,106,000,000
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(1,386,071,000,000)	(2,056,982,000,000)
Protection purchased with identical underlyings	1,402,201,000,000	2,078,096,000,000
Net protection (sold)/purchased	16,130,000,000	21,114,000,000
Other protection purchased	12,011,000,000	18,631,000,000
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(42,738,000,000)	(43,281,000,000)
Protection purchased with identical underlyings	38,158,000,000	32,048,000,000
Net protection (sold)/purchased	(4,580,000,000)	(11,233,000,000)
Other protection purchased	18,792,000,000	19,475,000,000
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	(30,000,000)	(40,000,000)
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	(30,000,000)	(40,000,000)
Other protection purchased	$ 4,715,000,000	$ 3,704,000,000