Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for credit losses, finance receivables
Beginning balance	$ 517	$ 410	$ 484	$ 373
Charge-offs	(112)	(97)	(237)	(198)
Recoveries	38	33	72	63
Provision for credit losses	73	108	194	211
Other	6	(5)	9	0
Ending balance	522	449	522	449
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	500	427	500	427
Specific impairment allowance	22	22	22	22
Ending balance	522	449	522	449
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	108,260	101,293	108,260	101,293
Specifically evaluated for impairment	562	492	562	492
Financing Receivables	108,822	101,785	108,822	101,785	$ 103,465
Ending balance, net of allowance for credit losses	108,300	101,336	108,300	101,336
Allowance for credit losses, net investment in operating leases
Beginning balance	67	53	64	49
Charge-offs	(52)	(41)	(104)	(81)
Recoveries	25	21	49	40
Other	0	1	0	1
Ending balance	66	63	66	63
Analysis of Ending Balance of Allowance for Credit Losses, Net Investment in Operating Leases [Abstract]
Collective impairment allowance	66	63	66	63
Specific impairment allowance	0	0	0	0
Ending balance	66	63	66	63
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment	26,759	26,824	26,759	26,824
Individually evaluated for impairment	0	0	0	0
Net investment in operating leases before allowance for credit losses	26,759	26,824	26,759	26,824	27,273
Ending balance, net investment in operating leases	26,693	26,761	26,693	26,761
Total allowance
Beginning balance	584	463	548	422
Charge-offs	(164)	(138)	(341)	(279)
Recoveries	63	54	121	103
Provision for credit losses	99	137	251	265
Other	6	(4)	9	1
Ending balance	588	512	588	512
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance	566	490	566	490
Specific impairment allowance	22	22	22	22
Ending balance	588	512	588	512
Net Investment in Operating Leases [Member]
Allowance for credit losses, finance receivables
Provision for credit losses	26	29	57	54
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	23		23		21
Allowance for credit losses, finance receivables
Beginning balance	504	390	469	357
Charge-offs	(110)	(94)	(233)	(196)
Recoveries	35	31	69	60
Provision for credit losses	73	109	194	211
Other	5	(4)	8	0
Ending balance	507	432	507	432
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	487	414	487	414
Specific impairment allowance	20	18	20	18
Ending balance	507	432	507	432
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	67,906	61,819	67,906	61,819
Specifically evaluated for impairment	381	366	381	366
Financing Receivables	68,287	62,185	68,287	62,185	65,338
Ending balance, net of allowance for credit losses	67,780	61,753	67,780	61,753
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1		1		0
Allowance for credit losses, finance receivables
Beginning balance	13	20	15	16
Charge-offs	(2)	(3)	(4)	(2)
Recoveries	3	2	3	3
Provision for credit losses	0	(1)	0	0
Other	1	(1)	1	0
Ending balance	15	17	15	17
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	13	13	13	13
Specific impairment allowance	2	4	2	4
Ending balance	15	17	15	17
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	40,354	39,474	40,354	39,474
Specifically evaluated for impairment	181	126	181	126
Financing Receivables	40,535	39,600	40,535	39,600	$ 38,127
Ending balance, net of allowance for credit losses	$ 40,520	$ 39,583	$ 40,520	$ 39,583