Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Total allowance
Beginning balance	$ 380	$ 408
Charge-offs	(105)	(95)
Recoveries	53	50
Provision for credit losses	31	29
Other	(1)	(3)
Ending balance	358	389
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance	332	366
Specific impairment allowance	26	23
Ending balance	358	389
Allowance for credit losses, finance receivables
Beginning balance	357	385
Charge-offs	(77)	(80)
Recoveries	39	39
Provision for credit losses	16	26
Other	(1)	(3)
Ending balance	334	367
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	308	344
Specific impairment allowance	26	23
Ending balance	334	367
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	83,864	76,515
Specifically evaluated for impairment	516	484
Financing Receivables	84,380	76,999	81,993
Ending balance, net of allowance for credit losses	84,046	76,632	81,636
Allowance for credit losses, net investment in operating leases
Beginning balance	23	23
Charge-offs	(28)	(15)
Recoveries	14	11
Other	0	0
Ending balance	24	22
Analysis of ending balance of allowance for credit losses, net investment in operating leases
Collective impairment allowance	24	22
Specific impairment allowance	0	0
Ending balance	24	22
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment	18,856	14,693
Individually evaluated for impairment	0	0
Net investment in operating leases before allowance for credit losses	18,856	14,693	18,300
Ending balance, net investment in operating leases	18,832	14,671	18,277
Consumer Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	327	356
Charge-offs	(75)	(79)
Recoveries	34	38
Provision for credit losses	23	28
Other	(2)	(3)
Ending balance	307	340
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	284	318
Specific impairment allowance	23	22
Ending balance	307	340
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	50,115	46,335
Specifically evaluated for impairment	424	418
Financing Receivables	50,539	46,753
Ending balance, net of allowance for credit losses	50,232	46,413
Commercial Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	30	29
Charge-offs	(2)	(1)
Recoveries	5	1
Provision for credit losses	(7)	(2)
Other	1	0
Ending balance	27	27
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	24	26
Specific impairment allowance	3	1
Ending balance	27	27
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	33,749	30,180
Specifically evaluated for impairment	92	66
Financing Receivables	33,841	30,246
Ending balance, net of allowance for credit losses	33,814	30,219
Net Investment in Operating Leases [Member]
Allowance for credit losses, finance receivables
Provision for credit losses	$ 15	$ 3