Finance Receivables - Credit Quality (Details) - Financial Services [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	$ 99,779	$ 96,436	$ 86,013
Consumer [Member]
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	$ 60,954	59,949	53,531
Consumer [Member] | Minimum [Member] | Special Mention [Member]
Credit quality ratings
Finance Receivables Credit Quality Ratings Term Range	61 days
Consumer [Member] | Minimum [Member] | Substandard [Member]
Credit quality ratings
Finance Receivables Credit Quality Ratings Term Range	120 days
Consumer [Member] | Maximum [Member] | Pass [Member]
Credit quality ratings
Finance Receivables Credit Quality Ratings Term Range	60 days
Consumer [Member] | Maximum [Member] | Special Mention [Member]
Credit quality ratings
Finance Receivables Credit Quality Ratings Term Range	120 days
Non-consumer [Member]
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	$ 38,825	36,487	$ 32,482
Non-consumer [Member] | Dealer financing [Member]
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	37,791	35,529
Non-consumer [Member] | Dealer financing [Member] | Group I
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	28,606	26,560
Non-consumer [Member] | Dealer financing [Member] | Group II
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	7,204	7,175
Non-consumer [Member] | Dealer financing [Member] | Group III
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	1,853	1,683
Non-consumer [Member] | Dealer financing [Member] | Group IV
Finance Receivable Credit Quality [Abstract]
Financing Receivable By Credit Quality Indicator	$ 128	$ 111