Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Results of discontinued credit card operations
Income from discontinued operations before income tax expense	$ 74	$ 196	$ 315	$ 464
Credit Card Receivable [Member]
Results of discontinued credit card operations
Net interest income and other revenues	129	558	541	1,106
Income from discontinued operations before income tax expense	$ 74	$ 195	$ 315	$ 465