Derivative Instruments and Other Financial Instruments Used For Hedging (Details 4) - Trading Derivatives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 4	$ 30	$ 27	$ 58
Interest rate derivative contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	(3)	15	7	34
Equity contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	0	2	0	3
Foreign exchange derivative contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	7	7	18	13
Commodity contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	0	6	2	7
Other contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 0	$ 0	$ 0	$ 1