Servicing Activities Servicing Activities (Narrative - Automobile Servicing Activities) (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
Servicing Activities [Abstract]
Automobile Servicing Fees	$ 30	$ 41	$ 60	$ 87