Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
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	$ (420,792)	$ (416,406)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(986,644)	(944,378)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(135,289)	(68,055)
Total notional amount	(1,542,725)	(1,428,839)
Fair value of receivables	24,342	24,362
Fair value of payables	(23,121)	(25,727)
Net fair value	1,221	(1,365)
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	(307,778)	(307,211)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(736,344)	(699,227)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(110,109)	(46,970)
Total notional amount	(1,154,231)	(1,053,408)
Fair value of receivables	12,619	13,539
Fair value of payables	(7,428)	(6,836)
Net fair value	5,191	6,703
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	(113,014)	(109,195)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from 1-5 years	(250,300)	(245,151)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than 5 years	(25,180)	(21,085)
Total notional amount	(388,494)	(375,431)
Fair value of receivables	11,723	10,823
Fair value of payables	(15,693)	(18,891)
Net fair value	$ (3,970)	$ (8,068)