Derivatives and Hedging Activities (Details 1) (Fair Value Hedging [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest rate contracts [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	$ 219	$ 189	$ 202	$ 602
Hedged item	(191)	(195)	(189)	(562)
Net hedge ineffectiveness	28	(6)	13	40
Total Return Swap [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net hedge ineffectiveness	(12)	0	12	0
Total Return Swap [Member] | Other revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract	166	0	166	0
Hedged item	$ (178)	$ 0	$ (178)	$ 0