Discontinued Operations (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Income (loss) from discontinued operations before income tax (benefit) expense	$ 74	$ 196	$ 315	$ 464
Bank Note [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net interest income and other revenues		3		19
Income (loss) from discontinued operations before income tax (benefit) expense		$ 1		$ (1)