Finance Receivables - Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 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	$ 84,380	$ 81,993	$ 76,999
International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	20,800	19,157
North America Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	63,580	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	11	14
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	633	754
61-90 days past due	71	105
91-120 days past due	22	27
Greater than 120 days past due	58	63
Total past due	784	949
Current	49,755	49,248
Financing Receivables	50,539	50,197
Consumer Portfolio Segment [Member] | International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	50	39
61-90 days past due	15	17
91-120 days past due	7	9
Greater than 120 days past due	26	26
Total past due	98	91
Current	11,006	10,459
Financing Receivables	11,104	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	56	88
91-120 days past due	15	18
Greater than 120 days past due	32	37
Total past due	686	858
Current	38,749	38,789
Financing Receivables	39,435	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	21	21
Finance Receivables Aging Analysis [Abstract]
Total past due	83	89
Current	33,758	31,707
Financing Receivables	33,841	31,796
Commercial Portfolio Segment [Member] | International Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	55	40
Current	9,641	8,567
Financing Receivables	9,696	8,607
Commercial Portfolio Segment [Member] | North America Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	28	49
Current	24,117	23,140
Financing Receivables	$ 24,145	$ 23,189