Finance Assets, Net (Schedule Of Allowance For Losses On Finance Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finance Assets, Net [Abstract]
Increase to allowance	$ (35)	$ (10)	$ 25
Balance at beginning of year		227	202	266
Allowance for Loan and Lease Losses, Period Increase (Decrease)		(10)	25	0
Amounts written-off		(118)	0	(64)
Balance at end of year		$ 99	$ 227	$ 202