Finance Assets, Net (Schedule Of Allowance For Losses On Finance Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of Investments [Line Items]
Balance at beginning of year	$ 227	$ 202
Decrease to allowance	(10)	0
Amounts written-off	(29)	0
Balance at June 30	$ 188	$ 202