Derivatives and Hedging Activities (Details 1) - Fair Value Hedging [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	$ (83)	$ (143)	$ (370)
Hedged item	93	148	351
Net hedge ineffectiveness	10	5	(19)
Other Revenues [Member] | Total Return Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	0	11	15
Hedged item	0	(11)	(15)
Net hedge ineffectiveness	$ 0	$ 0	$ 0