Servicing Activities (Narrative - Automobile Servicing Activities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Servicing Activities [Abstract]
Automobile Servicing Fees	$ 10	$ 7	$ 20	$ 16