Finance Receivables - Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Days After Which Finance Receivable Is Considered Past Due	any payment, including principal and interest, that is at least 31 days past the contractual due date
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	$ 85,522	$ 81,993	$ 79,075
International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	21,127	19,157
North America Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	64,395	62,836
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	15	14
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	624	754
61-90 days past due	89	105
91-120 days past due	26	27
Greater than 120 days past due	62	63
Total past due	801	949
Current	52,770	49,248
Financing Receivables	53,571	50,197
Consumer Portfolio Segment [Member] | International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	41	39
61-90 days past due	19	17
91-120 days past due	9	9
Greater than 120 days past due	22	26
Total past due	91	91
Current	11,454	10,459
Financing Receivables	11,545	10,550
Consumer Portfolio Segment [Member] | North America Segment [Member]
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	583	715
61-90 days past due	70	88
91-120 days past due	17	18
Greater than 120 days past due	40	37
Total past due	710	858
Current	41,316	38,789
Financing Receivables	42,026	39,647
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3	21
Finance Receivables Aging Analysis [Abstract]
Total past due	95	89
Current	31,856	31,707
Financing Receivables	31,951	31,796
Commercial Portfolio Segment [Member] | International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	92	40
Current	9,490	8,567
Financing Receivables	9,582	8,607
Commercial Portfolio Segment [Member] | North America Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	3	49
Current	22,366	23,140
Financing Receivables	$ 22,369	$ 23,189