Finance Assets, Net (Schedule Of Allowance For Losses On Finance Assets) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Amounts Written-Off [Member]	Mar. 31, 2012 Amounts Written-Off [Member]	Mar. 31, 2013 Management Assessment [Member]	Mar. 31, 2012 Management Assessment [Member]
Schedule of Investments [Line Items]
Balance at beginning of year	$ 79	$ 99	$ 204	$ 227
Decrease to Allowance					0	(23)	(20)	0
Balance at March 31	$ 79	$ 99	$ 204	$ 227