Debt Repurchases and Calls (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unsecured Debt [Member]
Debt Repurchases and Calls [Line Items]
Extinguishment of debt amount	$ 0	$ 0	$ 216	$ 163
Amount of debt extinguished that was due to mature in the current year	0	0	0	0
Gains/(Losses) on Extinguishment of Debt	$ 0	$ 0	$ 2	$ 1
Asset Backed Debt [Member]
Debt Repurchases and Calls [Line Items]
Repurchase or Called Debt Number of Transactions	0	0	0	0