Guarantor Condensed Consolidating Financial Statements - Guarantor Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities - continuing operations	$ 4,795	$ 3,566
Net cash provided by operating activities - discontinued operations	243	290
Net cash provided by operating activities	5,038	3,856
Cash flows from investing activities
Purchases of retail finance receivables, net	(15,267)	(10,408)
Principal collections and recoveries on retail finance receivables	9,410	7,368
Proceeds from transfer of retail finance receivables, net	0	0
Net funding of commercial finance receivables	(1,557)	(1,145)
Purchases of leased vehicles, net	(14,809)	(14,939)
Proceeds from termination of leased vehicles	4,649	1,799
Other investing activities	(65)	(59)
Net change in due from affiliates	0	0
Net change in investment in affiliates	0	0
Net cash used in investing activities - continuing operations	(17,639)	(17,384)
Net cash used in investing activities - discontinued operations	(468)	(949)
Net cash used in investing activities	(18,107)	(18,333)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	(305)	(301)
Borrowings and issuance of secured debt	26,731	18,420
Payments on secured debt	(20,905)	(12,525)
Borrowings and issuance of unsecured debt	12,626	10,358
Payments on unsecured debt	(4,375)	(2,345)
Debt issuance costs	(131)	(112)
Proceeds from issuance of preferred stock	985	0
Net capital contributions	0	0
Net change in due to affiliates	0	0
Net cash provided by financing activities - continuing operations	14,626	13,495
Net cash provided by financing activities - discontinued operations	63	601
Net cash provided by financing activities	14,689	14,096
Net increase (decrease) in cash, cash equivalents and restricted cash	1,620	(381)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	112	22
Cash, cash equivalents and restricted cash at beginning of period	5,302	5,002
Cash, cash equivalents and restricted cash at end of period	7,034	4,643
Cash, cash equivalents and restricted cash at end of period	5,302	5,002	$ 7,034	$ 5,302
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			3,976	2,815
Total	5,302	5,002	7,034	5,302
Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	6,469	3,918
Cash, cash equivalents and restricted cash at end of period	6,469	3,918	6,469
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			3,976
Restricted cash included in other assets			2,493
Total	6,469	3,918	6,469
Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	565	725
Cash, cash equivalents and restricted cash at end of period	565	725	565
Supplemental Cash Flow Elements [Abstract]
Total	565	725	565
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	11,754	12,315
Principal collections and recoveries on retail finance receivables	0	0
Proceeds from transfer of retail finance receivables, net	(11,754)	(12,315)
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	233	169
Net change in due from affiliates	11,610	14,127
Net change in investment in affiliates	(1,740)	(2,497)
Net cash used in investing activities - continuing operations	10,103	11,799
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	10,103	11,799
Cash flows from financing activities
Net change in debt (original maturities less than three months)	0	0
Borrowings and issuance of secured debt	(233)	(169)
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
Proceeds from issuance of preferred stock	0
Net capital contributions	1,740	2,497
Net change in due to affiliates	(11,610)	(14,127)
Net cash provided by financing activities - continuing operations	(10,103)	(11,799)
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	(10,103)	(11,799)
Net increase (decrease) 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	(690)	(454)
Net cash provided by operating activities - discontinued operations	26	(15)
Net cash provided by operating activities	(664)	(469)
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	(8,213)	(7,506)
Net change in investment in affiliates	54	24
Net cash used in investing activities - continuing operations	(8,159)	(7,482)
Net cash used in investing activities - discontinued operations	131	0
Net cash used in investing activities	(8,028)	(7,482)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	66	1
Borrowings and issuance of secured debt	0	0
Payments on secured debt	0	0
Borrowings and issuance of unsecured debt	10,133	8,987
Payments on unsecured debt	(2,450)	(1,000)
Debt issuance costs	(42)	(37)
Proceeds from issuance of preferred stock	985
Net capital contributions	0	0
Net change in due to affiliates	0	0
Net cash provided by financing activities - continuing operations	8,692	7,951
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	8,692	7,951
Net increase (decrease) 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	616	(389)
Net cash provided by operating activities - discontinued operations	(24)	10
Net cash provided by operating activities	592	(379)
Cash flows from investing activities
Purchases of retail finance receivables, net	(15,709)	(12,676)
Principal collections and recoveries on retail finance receivables	1,875	1,274
Proceeds from transfer of retail finance receivables, net	8,787	8,232
Net funding of commercial finance receivables	(429)	(335)
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Other investing activities	(288)	(219)
Net change in due from affiliates	(3,397)	(6,621)
Net change in investment in affiliates	1,686	2,473
Net cash used in investing activities - continuing operations	(7,475)	(7,872)
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	(7,475)	(7,872)
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
Proceeds from issuance of preferred stock	0
Net capital contributions	0	0
Net change in due to affiliates	8,145	7,643
Net cash provided by financing activities - continuing operations	8,145	7,643
Net cash provided by financing activities - discontinued operations	0	0
Net cash provided by financing activities	8,145	7,643
Net increase (decrease) in cash, cash equivalents and restricted cash	1,262	(608)
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	3,546	1,711
Cash, cash equivalents and restricted cash at end of period	2,284	2,319	3,546	2,284
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			3,546	2,284
Total	2,284	2,319	3,546	2,284
Guarantor [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	3,546	1,711
Cash, cash equivalents and restricted cash at end of period	3,546	1,711	3,546
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			3,546
Restricted cash included in other assets			0
Total	3,546	1,711	3,546
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	4,869	4,409
Net cash provided by operating activities - discontinued operations	241	295
Net cash provided by operating activities	5,110	4,704
Cash flows from investing activities
Purchases of retail finance receivables, net	(11,312)	(10,047)
Principal collections and recoveries on retail finance receivables	7,535	6,094
Proceeds from transfer of retail finance receivables, net	2,967	4,083
Net funding of commercial finance receivables	(1,128)	(810)
Purchases of leased vehicles, net	(14,809)	(14,939)
Proceeds from termination of leased vehicles	4,649	1,799
Other investing activities	(10)	(9)
Net change in due from affiliates	0	0
Net change in investment in affiliates	0	0
Net cash used in investing activities - continuing operations	(12,108)	(13,829)
Net cash used in investing activities - discontinued operations	(599)	(949)
Net cash used in investing activities	(12,707)	(14,778)
Cash flows from financing activities
Net change in debt (original maturities less than three months)	(371)	(302)
Borrowings and issuance of secured debt	26,964	18,589
Payments on secured debt	(20,905)	(12,525)
Borrowings and issuance of unsecured debt	2,493	1,371
Payments on unsecured debt	(1,925)	(1,345)
Debt issuance costs	(89)	(75)
Proceeds from issuance of preferred stock	0
Net capital contributions	(1,740)	(2,497)
Net change in due to affiliates	3,465	6,484
Net cash provided by financing activities - continuing operations	7,892	9,700
Net cash provided by financing activities - discontinued operations	63	601
Net cash provided by financing activities	7,955	10,301
Net increase (decrease) in cash, cash equivalents and restricted cash	358	227
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	112	22
Cash, cash equivalents and restricted cash at beginning of period	3,018	2,683
Cash, cash equivalents and restricted cash at end of period	3,488	2,932
Cash, cash equivalents and restricted cash at end of period	3,018	2,683	3,488	3,018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			430	531
Total	3,018	2,683	3,488	$ 3,018
Non-Guarantors [Member] | Continuing Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	2,923	2,207
Cash, cash equivalents and restricted cash at end of period	2,923	2,207	2,923
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents			430
Restricted cash included in other assets			2,493
Total	2,923	2,207	2,923
Non-Guarantors [Member] | Discontinued Operations [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash at end of period	565	725
Cash, cash equivalents and restricted cash at end of period	565	725	565
Supplemental Cash Flow Elements [Abstract]
Total	$ 565	$ 725	$ 565