Servicing Activities (Narrative - Automobile Servicing Activities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Servicing Activities [Abstract]
Automobile Servicing Fees	$ 13	$ 26	$ 48	$ 86