Debt Repurchases and Calls (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Debt Repurchases and Calls [Line Items]
Gains/(Losses) on extinguishment of debt	$ 0	$ (3,000,000)	$ (1,000,000)	$ (12,000,000)
Unsecured Debt [Member]
Debt Repurchases and Calls [Line Items]
Extinguishment of Debt, Amount	0		163,000,000
Disclosed Amount of Debt Maturing in Reporting Period	0		0
Gains/(Losses) on extinguishment of debt	0		(1,000,000)
Asset Backed Debt [Member]
Debt Repurchases and Calls [Line Items]
Securitizations, Number of Transactions	0		0
Unsecured and Asset Backed Debt [Member]
Debt Repurchases and Calls [Line Items]
Extinguishment of Debt, Amount		267,000,000		482,000,000
Disclosed Amount of Debt Maturing in Reporting Period		0		0
Gains/(Losses) on extinguishment of debt		$ (3,000,000)		$ (12,000,000)