Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Allowance for credit losses, finance receivables
Beginning balance	$ 410	$ 314	$ 373	$ 321
Charge-offs	(97)	(72)	(198)	(151)
Recoveries	33	32	63	64
Provision for credit losses	108	57	211	106
Other	(5)	4	0	(5)
Ending balance	449	335	449	335
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	427	316	427	316
Specific impairment allowance	22	19	22	19
Ending balance	449	335	449	335
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	101,293	89,372	101,293	89,372
Specifically evaluated for impairment	492	506	492	506
Financing Receivables	101,785	89,878	101,785	89,878	$ 97,196
Ending balance, net of allowance for credit losses	101,336	89,543	101,336	89,543
Allowance for credit losses, net investment in operating leases
Beginning balance	53	41	49	38
Charge-offs	(41)	(26)	(81)	(56)
Recoveries	21	16	40	31
Other	1	(1)	1	(1)
Ending balance	63	45	63	45
Analysis of Ending Balance of Allowance for Credit Losses, Net Investment in Operating Leases [Abstract]
Collective impairment allowance	63	45	63	45
Specific impairment allowance	0	0	0	0
Ending balance	63	45	63	45
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment	26,824	23,428	26,824	23,428
Individually evaluated for impairment	0	0	0	0
Net investment in operating leases before allowance for credit losses	26,824	23,428	26,824	23,428	25,128
Ending balance, net investment in operating leases	26,761	23,383	26,761	23,383
Total allowance
Beginning balance	463	355	422	359
Charge-offs	(138)	(98)	(279)	(207)
Recoveries	54	48	103	95
Provision for credit losses	137	72	265	139
Other	(4)	3	1	(6)
Ending balance	512	380	512	380
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance	490	361	490	361
Specific impairment allowance	22	19	22	19
Ending balance	512	380	512	380
Net Investment in Operating Leases [Member]
Allowance for credit losses, finance receivables
Provision for credit losses	29	15	54	33
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	20		20		16
Allowance for credit losses, finance receivables
Beginning balance	390	301	357	305
Charge-offs	(94)	(70)	(196)	(150)
Recoveries	31	31	60	61
Provision for credit losses	109	57	211	110
Other	(4)	3	0	(4)
Ending balance	432	322	432	322
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	414	303	414	303
Specific impairment allowance	18	19	18	19
Ending balance	432	322	432	322
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	61,819	55,527	61,819	55,527
Specifically evaluated for impairment	366	380	366	380
Financing Receivables	62,185	55,907	62,185	55,907	59,949
Ending balance, net of allowance for credit losses	61,753	55,585	61,753	55,585
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3		3		1
Allowance for credit losses, finance receivables
Beginning balance	20	13	16	16
Charge-offs	(3)	(2)	(2)	(1)
Recoveries	2	1	3	3
Provision for credit losses	(1)	0	0	(4)
Other	(1)	1	0	(1)
Ending balance	17	13	17	13
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	13	13	13	13
Specific impairment allowance	4	0	4	0
Ending balance	17	13	17	13
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	39,474	33,845	39,474	33,845
Specifically evaluated for impairment	126	126	126	126
Financing Receivables	39,600	33,971	39,600	33,971	$ 37,247
Ending balance, net of allowance for credit losses	$ 39,583	$ 33,958	$ 39,583	$ 33,958