Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than 1 year	$ (416,406)	$ (480,679)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(944,378)	(1,515,091)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(68,055)	(104,533)
Total notional amount	(1,428,839)	(2,100,303)
Fair value of receivables	24,362	46,444
Fair value of payables	(25,727)	(28,769)
Net fair value	(1,365)	17,675
Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than 1 year	(307,211)	(323,398)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(699,227)	(1,118,293)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(46,970)	(79,486)
Total notional amount	(1,053,408)	(1,521,177)
Fair value of receivables	13,539	25,767
Fair value of payables	(6,836)	(6,314)
Net fair value	6,703	19,453
Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than 1 year	(109,195)	(157,281)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(245,151)	(396,798)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(21,085)	(25,047)
Total notional amount	(375,431)	(579,126)
Fair value of receivables	10,823	20,677
Fair value of payables	(18,891)	(22,455)
Net fair value	$ (8,068)	$ (1,778)