Derivatives and Hedging Activities (Details 1) (Fair Value Hedging [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	$ (109)	$ (11)	$ (170)	$ (305)
Hedged item	112	5	176	295
Net hedge ineffectiveness	3	(6)	6	(10)
Other Income [Member] | Total Return Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	0	(21)	11	(10)
Hedged item	0	21	(11)	10
Net hedge ineffectiveness	$ 0	$ 0	$ 0	$ 0