Finance Receivables - Impaired (Details) - Financial Services [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable Impaired [Abstract]
Number of Days Past Due After Which Consumer Receivables are Considered Impaired	greater than 120 days past due
Consumer [Member]
Financing Receivable Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	$ 375	$ 415
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.60%	0.80%
Non-consumer [Member]
Financing Receivable Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	$ 129	$ 105
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.40%	0.30%