Derivative Instruments - Credit Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
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	(997,873,000,000)	$ (1,428,839,000,000)
Protection purchased with identical underlyings	1,006,111,000,000	1,440,359,000,000
Net protection (sold)/purchased	8,238,000,000	11,520,000,000
Other protection purchased	32,431,000,000	35,518,000,000
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(997,832,000,000)	(1,428,809,000,000)
Protection purchased with identical underlyings	1,006,111,000,000	1,440,359,000,000
Net protection (sold)/purchased	8,279,000,000	11,550,000,000
Other protection purchased	27,926,000,000	30,803,000,000
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(961,003,000,000)	(1,386,071,000,000)
Protection purchased with identical underlyings	974,252,000,000	1,402,201,000,000
Net protection (sold)/purchased	13,249,000,000	16,130,000,000
Other protection purchased	7,935,000,000	12,011,000,000
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(36,829,000,000)	(42,738,000,000)
Protection purchased with identical underlyings	31,859,000,000	38,158,000,000
Net protection (sold)/purchased	(4,970,000,000)	(4,580,000,000)
Other protection purchased	19,991,000,000	18,792,000,000
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	(41,000,000)	(30,000,000)
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	(41,000,000)	(30,000,000)
Other protection purchased	$ 4,505,000,000	$ 4,715,000,000