Guarantor Condensed Consolidating Financial Statements - Guarantor Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	$ 3,143	$ 2,250
Net cash provided by operating activities - discontinued operations	176	368
Net cash provided by operating activities	3,319	2,618
Cash flows from investing activities
Purchases of retail finance receivables, net	(10,698)	(6,411)
Principal collections and recoveries on retail finance receivables	6,020	4,938
Proceeds from transfer of retail finance receivables, net	0	0
Net funding of commercial finance receivables	(1,761)	(523)
Purchases of leased vehicles, net	(9,884)	(10,138)
Proceeds from termination of leased vehicles	2,724	1,089
Other investing activities	(47)	(40)
Net change in due from affiliates	0	0
Net change in investment in affiliates	0	0
Net cash used in investing activities - continuing operations	(13,646)	(11,085)
Net cash used in investing activities - discontinued operations	(364)	(1,136)
Net cash used in investing activities	(14,010)	(12,221)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	(351)	(320)
Borrowings and issuance of secured debt	15,670	13,065
Payments on secured debt	(11,690)	(8,468)
Borrowings and issuance of unsecured debt	11,033	6,387
Payments on unsecured debt	(1,201)	(1,758)
Debt issuance costs	(95)	(78)
Net capital contributions	0	0
Net change in due to affiliates	0	0
Net cash provided by financing activities - continuing operations	13,366	8,828
Net cash provided by financing activities - discontinued operations	65	850
Net cash provided by financing activities	13,431	9,678
Net increase in cash, cash equivalents and restricted cash	2,740	75
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	78	35
Cash, cash equivalents and restricted cash at beginning of period	5,302	5,002
Cash, cash equivalents and restricted cash at end of period	8,120	5,112
Cash, cash equivalents and restricted cash at end of period	5,302	5,002	$ 8,120	$ 5,302
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			5,201	2,815
Total	5,302	5,002	8,120	5,302
Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	7,497	4,385
Cash, cash equivalents and restricted cash at end of period	7,497	4,385	7,497
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			5,201
Restricted cash included in other assets			2,296
Total	7,497	4,385	7,497
Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	623	727
Cash, cash equivalents and restricted cash at end of period	623	727	623
Supplemental Cash Flow Elements [Abstract]
Total	623	727	623
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	0	0
Net cash provided by operating activities - discontinued operations	0	0
Net cash provided by operating activities	0	0
Cash flows from investing activities
Purchases of retail finance receivables, net	6,756	8,190
Principal collections and recoveries on retail finance receivables	0	0
Proceeds from transfer of retail finance receivables, net	(6,756)	(8,190)
Net funding of commercial finance receivables	0	0
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Other investing activities	117	139
Net change in due from affiliates	13,117	7,461
Net change in investment in affiliates	(1,146)	(729)
Net cash used in investing activities - continuing operations	12,088	6,871
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	12,088	6,871
Cash flows from financing activities
Net change in debt (original maturities less than three months)	0	0
Borrowings and issuance of secured debt	(117)	(139)
Payments on secured debt	0	0
Borrowings and issuance of unsecured debt	0	0
Payments on unsecured debt	0	0
Debt issuance costs	0	0
Net capital contributions	1,146	729
Net change in due to affiliates	(13,117)	(7,461)
Net cash provided by financing activities - continuing operations	(12,088)	(6,871)
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	(12,088)	(6,871)
Net increase in cash, cash equivalents and restricted cash	0	0
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0	0
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents				0
Total	0	0	0	0
Eliminations [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			0
Restricted cash included in other assets			0
Total	0	0	0
Eliminations [Member] | Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Supplemental Cash Flow Elements [Abstract]
Total	0	0	0
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	(360)	(218)
Net cash provided by operating activities - discontinued operations	0	0
Net cash provided by operating activities	(360)	(218)
Cash flows from investing activities
Purchases of retail finance receivables, net	0	0
Principal collections and recoveries on retail finance receivables	0	0
Proceeds from transfer of retail finance receivables, net	0	0
Net funding of commercial finance receivables	0	0
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Other investing activities	0	0
Net change in due from affiliates	(9,232)	(4,503)
Net change in investment in affiliates	12	6
Net cash used in investing activities - continuing operations	(9,220)	(4,497)
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	(9,220)	(4,497)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	30	0
Borrowings and issuance of secured debt	0	0
Payments on secured debt	0	0
Borrowings and issuance of unsecured debt	9,588	5,740
Payments on unsecured debt	0	(1,000)
Debt issuance costs	(38)	(25)
Net capital contributions	0	0
Net change in due to affiliates	0	0
Net cash provided by financing activities - continuing operations	9,580	4,715
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	9,580	4,715
Net increase in cash, cash equivalents and restricted cash	0	0
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0	0
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents				0
Total	0	0	0	0
Parent Company [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			0
Restricted cash included in other assets			0
Total	0	0	0
Parent Company [Member] | Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Supplemental Cash Flow Elements [Abstract]
Total	0	0	0
Guarantor [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	386	(151)
Net cash provided by operating activities - discontinued operations	(7)	0
Net cash provided by operating activities	379	(151)
Cash flows from investing activities
Purchases of retail finance receivables, net	(10,315)	(8,110)
Principal collections and recoveries on retail finance receivables	1,167	780
Proceeds from transfer of retail finance receivables, net	5,521	5,250
Net funding of commercial finance receivables	(605)	(124)
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Other investing activities	(157)	(174)
Net change in due from affiliates	(3,885)	(2,958)
Net change in investment in affiliates	1,134	723
Net cash used in investing activities - continuing operations	(7,140)	(4,613)
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	(7,140)	(4,613)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	0	0
Borrowings and issuance of secured debt	0	0
Payments on secured debt	0	0
Borrowings and issuance of unsecured debt	0	0
Payments on unsecured debt	0	0
Debt issuance costs	0	0
Net capital contributions	0	0
Net change in due to affiliates	9,163	4,668
Net cash provided by financing activities - continuing operations	9,163	4,668
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	9,163	4,668
Net increase in cash, cash equivalents and restricted cash	2,402	(96)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	2,284	2,319
Cash, cash equivalents and restricted cash at end of period	4,686	2,223
Cash, cash equivalents and restricted cash at end of period	2,284	2,319	4,686	2,284
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents				2,284
Total	2,284	2,319	4,686	2,284
Guarantor [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	4,686	2,223
Cash, cash equivalents and restricted cash at end of period	4,686	2,223	4,686
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			4,686
Restricted cash included in other assets			0
Total	4,686	2,223	4,686
Guarantor [Member] | Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Supplemental Cash Flow Elements [Abstract]
Total	0	0	0
Non-Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	3,117	2,619
Net cash provided by operating activities - discontinued operations	183	368
Net cash provided by operating activities	3,300	2,987
Cash flows from investing activities
Purchases of retail finance receivables, net	(7,139)	(6,491)
Principal collections and recoveries on retail finance receivables	4,853	4,158
Proceeds from transfer of retail finance receivables, net	1,235	2,940
Net funding of commercial finance receivables	(1,156)	(399)
Purchases of leased vehicles, net	(9,884)	(10,138)
Proceeds from termination of leased vehicles	2,724	1,089
Other investing activities	(7)	(5)
Net change in due from affiliates	0	0
Net change in investment in affiliates	0	0
Net cash used in investing activities - continuing operations	(9,374)	(8,846)
Net cash used in investing activities - discontinued operations	(364)	(1,136)
Net cash used in investing activities	(9,738)	(9,982)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	(381)	(320)
Borrowings and issuance of secured debt	15,787	13,204
Payments on secured debt	(11,690)	(8,468)
Borrowings and issuance of unsecured debt	1,445	647
Payments on unsecured debt	(1,201)	(758)
Debt issuance costs	(57)	(53)
Net capital contributions	(1,146)	(729)
Net change in due to affiliates	3,954	2,793
Net cash provided by financing activities - continuing operations	6,711	6,316
Net cash provided by financing activities - discontinued operations	65	850
Net cash provided by financing activities	6,776	7,166
Net increase in cash, cash equivalents and restricted cash	338	171
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	78	35
Cash, cash equivalents and restricted cash at beginning of period	3,018	2,683
Cash, cash equivalents and restricted cash at end of period	3,434	2,889
Cash, cash equivalents and restricted cash at end of period	3,018	2,683	3,434	3,018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents				531
Total	3,018	2,683	3,434	$ 3,018
Non-Guarantors [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	2,811	2,162
Cash, cash equivalents and restricted cash at end of period	2,811	2,162	2,811
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			515
Total	2,811	2,162	2,811
Non-Guarantors [Member] | Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	623	727
Cash, cash equivalents and restricted cash at end of period	623	727	623
Supplemental Cash Flow Elements [Abstract]
Total	$ 623	$ 727	$ 623