Derivatives and Hedging Activities (Details 1) - Fair Value Hedging [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	$ (89)	$ (10)	$ (26)	$ (60)
Hedged item	85	14	29	64
Net hedge ineffectiveness	(4)	4	3	4
Other Income [Member] | Total Return Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	0	(1)	0	11
Hedged item	0	1	0	(11)
Net hedge ineffectiveness	$ 0	$ 0	$ 0	$ 0