Fair Value Measurement - Impact of Credit Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Credit Valuation Adjustment
Impact of credit adjustments on earnings [Abstract]
Derivative credit adjustments	$ 341	$ 272	$ 522	$ 253
Debit Valuation Adjustment and Funding Valuation Adjustment
Impact of credit adjustments on earnings [Abstract]
Derivative credit adjustments	204	(36)	63	(161)
Structured note credit adjustments	503	162	651	179
Debit Valuation Adjustment
Impact of credit adjustments on earnings [Abstract]
Derivative credit adjustments	44	(1)	57	(95)
Structured note credit adjustments	$ 215	$ 134	$ 323	$ 19