Derivatives and Hedging Activities (Details 1) (Fair Value Hedging [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Other Expense [Member] | Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	$ (83)	$ (158)
Hedged item	69	139
Net hedge ineffectiveness	(14)	19
Other revenues [Member] | Total Return Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	(32)	0
Hedged item	32	0
Net hedge ineffectiveness	$ 0	$ 0