Guarantor Consolidating Financial Statements - Guarantor Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 254	$ 147	$ 189	$ 164	$ 131	$ 179	$ 186	$ 150	$ 754	$ 646	$ 537
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									4,839	2,403	992
Accretion and amortization of loan and leasing fees									(1,172)	(609)	(363)
Amortization of carrying value adjustment									(29)	(149)	(234)
Undistributed earnings of non-consolidated affiliates, net									(22)	(116)	0
Provision for loan losses									669	624	604
Deferred income taxes									42	132	(83)
Stock-based compensation expense									25	36	19
Other operating activities									1	(37)	182
Changes in assets and liabilities, net of assets and liabilities acquired:
Other assets									(443)	(375)	(85)
Accounts payable and accrued expenses									214	282	133
Taxes payable									(2)	(20)	(63)
Related party taxes payable									0	(636)	(7)
Related party payables									5	(13)	5
Net cash provided by operating activities									4,881	2,168	1,637
Cash flows from investing activities
Purchases of retail finance receivables, net									(17,796)	(17,517)	(14,749)
Principal collections and recoveries on retail finance receivables									13,172	11,726	10,860
Proceeds from transfer of retail finance receivables, net									0	0	0
Net funding of commercial finance receivables									(2,981)	(1,017)	(1,898)
Purchases of leased vehicles, net									(19,612)	(15,337)	(4,882)
Proceeds from termination of leased vehicles									2,557	1,096	533
Acquisition of international operations									0	(1,049)	(46)
Disposition of equity interest									0	125	0
Purchases of property and equipment									(107)	(90)	(52)
Other investing activities									(7)	30	(2)
Net change in due from affiliates									0	0	0
Net change in investment in affiliates									0	0	0
Net cash used in investing activities									(24,774)	(22,033)	(10,236)
Cash flows from financing activities
Net change in debt (original maturities less than three months)									780	1,147	470
Borrowings and issuance of secured debt									29,421	22,385	21,080
Payments on secured debt									(20,266)	(15,178)	(16,890)
Borrowings and issuance of unsecured debt									13,282	12,977	7,174
Payments on unsecured debt									(2,837)	(1,709)	(1,889)
Borrowings on related party line of credit									418	0	0
Payments on related party line of credit									(418)	0	0
Capital contributions									0	649	996
Debt issuance costs									(146)	(155)	(127)
Other									0	1	0
Net change in due to affiliates									0	0	0
Net cash provided by financing activities									20,234	20,117	10,814
Net increase in cash, cash equivalents and restricted cash									341	252	2,215
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									(41)	(295)	(201)
Cash, cash equivalents and restricted cash at beginning of period				5,002				5,045	5,002	5,045	3,031
Cash, cash equivalents and restricted cash at end of period	5,302				5,002				5,302	5,002	5,045
Supplemental Cash Flow Elements
Cash and cash equivalents												$ 3,201	$ 3,061
Restricted cash included in other assets												2,101	1,941
Total cash, cash equivalents and restricted cash as presented in the consolidated statements of cash flows	5,302			5,002	5,002			5,045	5,002	5,045	3,031	5,302	5,002
General Motors Financial Company, Inc. [Member]
Cash flows from operating activities
Net income									754	646	537
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									37	28	14
Accretion and amortization of loan and leasing fees									0	0	0
Amortization of carrying value adjustment									0	0	0
Undistributed earnings of non-consolidated affiliates, net									(994)	(941)	(757)
Provision for loan losses									0	0	0
Deferred income taxes									(313)	(189)	1
Stock-based compensation expense									24	33	18
Other operating activities									(299)	32	137
Changes in assets and liabilities, net of assets and liabilities acquired:
Other assets									18	(3)	(18)
Accounts payable and accrued expenses									117	100	36
Taxes payable									(1)	(12)	(3)
Related party taxes payable										(636)	(7)
Related party payables									0	1	0
Net cash provided by operating activities									(657)	(941)	(42)
Cash flows from investing activities
Purchases of retail finance receivables, net									0	0	0
Principal collections and recoveries on retail finance receivables									0	0	0
Proceeds from transfer of retail finance receivables, net									0	0	0
Net funding of commercial finance receivables									0	0	0
Purchases of leased vehicles, net									0	0	0
Proceeds from termination of leased vehicles									0	0	0
Acquisition of international operations										(513)	(46)
Disposition of equity interest										0
Purchases of property and equipment									0	0	0
Other investing activities									0	0	0
Net change in due from affiliates									(8,966)	(8,819)	(3,149)
Net change in investment in affiliates									339	(6)	(357)
Net cash used in investing activities									(8,627)	(9,338)	(3,552)
Cash flows from financing activities
Net change in debt (original maturities less than three months)									8	0	0
Borrowings and issuance of secured debt									0	0	0
Payments on secured debt									0	0	0
Borrowings and issuance of unsecured debt									10,320	9,687	3,500
Payments on unsecured debt									(1,000)	0	0
Borrowings on related party line of credit									418
Payments on related party line of credit									(418)
Capital contributions									0	649	996
Debt issuance costs									(44)	(58)	(39)
Other										1
Net change in due to affiliates									0	0	(863)
Net cash provided by financing activities									9,284	10,279	3,594
Net increase in cash, cash equivalents and restricted cash									0	0	0
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									0	0	0
Cash, cash equivalents and restricted cash at beginning of period				0				0	0	0	0
Cash, cash equivalents and restricted cash at end of period	0				0				0	0	0
Supplemental Cash Flow Elements
Cash and cash equivalents												0	0
Restricted cash included in other assets												0	0
Total cash, cash equivalents and restricted cash as presented in the consolidated statements of cash flows	0			0	0			0	0	0	0	0	0
Guarantor [Member]
Cash flows from operating activities
Net income									704	609	548
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									26	3	2
Accretion and amortization of loan and leasing fees									17	25	4
Amortization of carrying value adjustment									(3)	(14)	(4)
Undistributed earnings of non-consolidated affiliates, net									(771)	(579)	(523)
Provision for loan losses									378	398	334
Deferred income taxes									(390)	2	127
Stock-based compensation expense									0	0	0
Other operating activities									289	(5)	(2)
Changes in assets and liabilities, net of assets and liabilities acquired:
Other assets									(347)	25	(14)
Accounts payable and accrued expenses									(438)	531	(25)
Taxes payable									0	1	0
Related party taxes payable										0	0
Related party payables									0	0	0
Net cash provided by operating activities									(535)	996	447
Cash flows from investing activities
Purchases of retail finance receivables, net									(15,847)	(13,997)	(8,220)
Principal collections and recoveries on retail finance receivables									1,542	755	(99)
Proceeds from transfer of retail finance receivables, net									13,897	10,428	6,369
Net funding of commercial finance receivables									(191)	6	(128)
Purchases of leased vehicles, net									0	0	0
Proceeds from termination of leased vehicles									0	0	0
Acquisition of international operations										(536)	0
Disposition of equity interest										125
Purchases of property and equipment									(82)	(21)	(20)
Other investing activities									(169)	0	0
Net change in due from affiliates									(8,508)	(5,593)	(443)
Net change in investment in affiliates									787	(1,893)	(27)
Net cash used in investing activities									(8,571)	(10,726)	(2,568)
Cash flows from financing activities
Net change in debt (original maturities less than three months)									0	0	0
Borrowings and issuance of secured debt									0	0	0
Payments on secured debt									0	0	0
Borrowings and issuance of unsecured debt									0	0	0
Payments on unsecured debt									0	0	0
Borrowings on related party line of credit									0
Payments on related party line of credit									0
Capital contributions									0	0	0
Debt issuance costs									0	0	0
Other										0
Net change in due to affiliates									9,071	9,766	3,989
Net cash provided by financing activities									9,071	9,766	3,989
Net increase in cash, cash equivalents and restricted cash									(35)	36	1,868
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									0	0	0
Cash, cash equivalents and restricted cash at beginning of period				2,319				2,283	2,319	2,283	415
Cash, cash equivalents and restricted cash at end of period	2,284				2,319				2,284	2,319	2,283
Supplemental Cash Flow Elements
Cash and cash equivalents												2,284	2,259
Restricted cash included in other assets												0	60
Total cash, cash equivalents and restricted cash as presented in the consolidated statements of cash flows	2,284			2,319	2,319			2,283	2,319	2,283	415	2,284	2,319
Non-Guarantors [Member]
Cash flows from operating activities
Net income									1,061	911	732
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									4,776	2,372	976
Accretion and amortization of loan and leasing fees									(1,189)	(634)	(367)
Amortization of carrying value adjustment									(26)	(135)	(230)
Undistributed earnings of non-consolidated affiliates, net									(22)	(116)	0
Provision for loan losses									291	226	270
Deferred income taxes									745	319	(211)
Stock-based compensation expense									1	3	1
Other operating activities									11	(64)	47
Changes in assets and liabilities, net of assets and liabilities acquired:
Other assets									(114)	(397)	(53)
Accounts payable and accrued expenses									535	(349)	122
Taxes payable									(1)	(9)	(60)
Related party taxes payable										0	0
Related party payables									5	(14)	5
Net cash provided by operating activities									6,073	2,113	1,232
Cash flows from investing activities
Purchases of retail finance receivables, net									(20,080)	(16,981)	(14,321)
Principal collections and recoveries on retail finance receivables									11,630	10,971	10,959
Proceeds from transfer of retail finance receivables, net									4,234	3,033	1,423
Net funding of commercial finance receivables									(2,790)	(1,023)	(1,770)
Purchases of leased vehicles, net									(19,612)	(15,337)	(4,882)
Proceeds from termination of leased vehicles									2,557	1,096	533
Acquisition of international operations										0	0
Disposition of equity interest										0
Purchases of property and equipment									(25)	(69)	(32)
Other investing activities									(7)	30	(2)
Net change in due from affiliates									0	0	(400)
Net change in investment in affiliates									0	0	0
Net cash used in investing activities									(24,093)	(18,280)	(8,492)
Cash flows from financing activities
Net change in debt (original maturities less than three months)									772	1,147	470
Borrowings and issuance of secured debt									29,590	22,385	21,080
Payments on secured debt									(20,266)	(15,178)	(16,890)
Borrowings and issuance of unsecured debt									2,962	3,290	3,674
Payments on unsecured debt									(1,837)	(1,709)	(1,889)
Borrowings on related party line of credit									0
Payments on related party line of credit									0
Capital contributions									(1,126)	1,899	382
Debt issuance costs									(102)	(97)	(88)
Other										0
Net change in due to affiliates									8,403	4,646	866
Net cash provided by financing activities									18,396	16,383	7,605
Net increase in cash, cash equivalents and restricted cash									376	216	345
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									(41)	(295)	(199)
Cash, cash equivalents and restricted cash at beginning of period				2,683				2,762	2,683	2,762	2,616
Cash, cash equivalents and restricted cash at end of period	3,018				2,683				3,018	2,683	2,762
Supplemental Cash Flow Elements
Cash and cash equivalents												917	802
Restricted cash included in other assets												2,101	1,881
Total cash, cash equivalents and restricted cash as presented in the consolidated statements of cash flows	3,018			2,683	2,683			2,762	2,683	2,762	2,616	3,018	2,683
Eliminations [Member]
Cash flows from operating activities
Net income									(1,765)	(1,520)	(1,280)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									0	0	0
Accretion and amortization of loan and leasing fees									0	0	0
Amortization of carrying value adjustment									0	0	0
Undistributed earnings of non-consolidated affiliates, net									1,765	1,520	1,280
Provision for loan losses									0	0	0
Deferred income taxes									0	0	0
Stock-based compensation expense									0	0	0
Other operating activities									0	0	0
Changes in assets and liabilities, net of assets and liabilities acquired:
Other assets									0	0	0
Accounts payable and accrued expenses									0	0	0
Taxes payable									0	0	0
Related party taxes payable										0	0
Related party payables									0	0	0
Net cash provided by operating activities									0	0	0
Cash flows from investing activities
Purchases of retail finance receivables, net									18,131	13,461	7,792
Principal collections and recoveries on retail finance receivables									0	0	0
Proceeds from transfer of retail finance receivables, net									(18,131)	(13,461)	(7,792)
Net funding of commercial finance receivables									0	0	0
Purchases of leased vehicles, net									0	0	0
Proceeds from termination of leased vehicles									0	0	0
Acquisition of international operations										0	0
Disposition of equity interest										0
Purchases of property and equipment									0	0	0
Other investing activities									169	0	0
Net change in due from affiliates									17,474	14,412	3,992
Net change in investment in affiliates									(1,126)	1,899	384
Net cash used in investing activities									16,517	16,311	4,376
Cash flows from financing activities
Net change in debt (original maturities less than three months)									0	0	0
Borrowings and issuance of secured debt									(169)	0	0
Payments on secured debt									0	0	0
Borrowings and issuance of unsecured debt									0	0	0
Payments on unsecured debt									0	0	0
Borrowings on related party line of credit									0
Payments on related party line of credit									0
Capital contributions									1,126	(1,899)	(382)
Debt issuance costs									0	0	0
Other										0
Net change in due to affiliates									(17,474)	(14,412)	(3,992)
Net cash provided by financing activities									(16,517)	(16,311)	(4,374)
Net increase in cash, cash equivalents and restricted cash									0	0	2
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									0	0	(2)
Cash, cash equivalents and restricted cash at beginning of period				0				0	0	0	0
Cash, cash equivalents and restricted cash at end of period	0				0				0	0	0
Supplemental Cash Flow Elements
Cash and cash equivalents												0	0
Restricted cash included in other assets												0	0
Total cash, cash equivalents and restricted cash as presented in the consolidated statements of cash flows	$ 0			$ 0	$ 0			$ 0	$ 0	$ 0	$ 0	$ 0	$ 0