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Contingencies - Sales Recourse Obligations Reserve Activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Finance Receivables Reserve for Sales Recourse Obligations [Roll Forward]        
Balance at beginning of period $ 15 $ 24 $ 15 $ 24
Recourse losses 0 (5) 0 (5)
Provision for recourse obligations, net of recoveries 0 (1) 0 (1)
Balance at end of period $ 15 $ 18 $ 15 $ 18