Derivative Instruments and Other Financial Instruments Used For Hedging (Details 4) - Trading Derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 19	$ 18	$ 30	$ 23
Interest rate derivative contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	8	12	10	10
Equity [Member]
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	(1)	0	(1)	0
Foreign exchange derivative contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	11	5	20	11
Commodity contracts
Trading Derivatives
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 1	$ 1	$ 1	$ 2