Finance Receivables - Maturities and Investments in Direct Financing Leases (Details) (Financial Services [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finance Receivables Maturity [Abstract]
Finance Receivables Current	$ 45,681
Finance Receivables In Two Years	16,358
Finance Receivables In Three Years	11,882
Finance Receivables In Four Years And Thereafter	14,301
Total Finance Receivable Before Unearned Interest Supplements	88,222
Consumer [Member]
Finance Receivables Maturity [Abstract]
Finance Receivables Current	16,080
Finance Receivables In Two Years	14,821
Finance Receivables In Three Years	11,694
Finance Receivables In Four Years And Thereafter	13,261
Total Finance Receivable Before Unearned Interest Supplements	55,856	51,699
Consumer [Member] | Finance Leases Financing Receivable [Member]
Investments in Direct Financing Leases [Abstract]
Estimated residual values	154
Non-consumer [Member] | Wholesale and Dealer Loans [Member]
Finance Receivables Maturity [Abstract]
Finance Receivables Current	28,585
Finance Receivables In Two Years	1,528
Finance Receivables In Three Years	187
Finance Receivables In Four Years And Thereafter	1,040
Total Finance Receivable Before Unearned Interest Supplements	31,340
Non-consumer [Member] | Other Finance Receivables [Member]
Finance Receivables Maturity [Abstract]
Finance Receivables Current	1,016
Finance Receivables In Two Years	9
Finance Receivables In Three Years	1
Finance Receivables In Four Years And Thereafter	0
Total Finance Receivable Before Unearned Interest Supplements	$ 1,026