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Finance Assets, Net (Schedule Of Allowance For Losses On Finance Assets) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Schedule of Investments [Line Items]      
Balance at beginning of year   $ 99 $ 227
Allowance for Loan and Lease Losses, Adjustments, Net (27) (47) (10)
Allowance for Loan and Lease Losses, Write-offs   0 (29)
Balance at June 30 $ 52 $ 52 $ 188