Derivative Instruments (Details 3) (Asset and Liability Management Positions [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash flow hedges [Member] | Interest rate contracts [Member] | Pay fixed/receive floating swaps [Member]
Summary of effective portion of the gains (losses) recognized in other comprehensive income and the gains (losses) reclassified from other comprehensive income (Loss) into earnings
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ (84)	$ (139)	$ (79)	$ (206)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	(35)	(36)	(69)	(79)
Net investment hedges [Member] | Foreign exchange forward contracts [Member]
Summary of effective portion of the gains (losses) recognized in other comprehensive income and the gains (losses) reclassified from other comprehensive income (Loss) into earnings
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ (15)	$ 48	$ (47)	$ 17