Guarantor Condensed Consolidating Financial Statements Guarantor Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 2,167	$ 1,400
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(13,099)	(10,850)
Principal collections and recoveries on consumer finance receivables	8,718	8,124
Proceeds from sale of consumer finance receivables, net	0	0
Net funding of commercial finance receivables	(179)	(408)
Purchases of leased vehicles, net	(11,258)	(3,227)
Proceeds from termination of leased vehicles	662	395
Acquisition of international operations	(1,049)	(46)
Disposition of equity interest	125
Purchases of property and equipment	(64)	(37)
Change in restricted cash	(236)	(187)
Change in other assets	24	(2)
Net change in investment in affiliates	0	0
Net cash used in investing activities	(16,356)	(6,238)
Cash flows from financing activities:
Net change in debt (original maturities less than three months)	539	(913)
Borrowings and issuance of secured debt	15,095	15,847
Payments on secured debt	(10,903)	(13,568)
Borrowings and issuance of unsecured debt	9,559	5,403
Payments on unsecured debt	(1,195)	(1,339)
Net capital contributions	0	0
Debt issuance costs	(124)	(107)
Net change in due from/due to affiliates	0	0
Net cash provided by financing activities	12,971	5,323
Net (decrease) increase in cash and cash equivalents	(1,218)	485
Effect of foreign exchange rate changes on cash and cash equivalents	(154)	(42)
Cash and cash equivalents at beginning of period	2,974	1,074
Cash and cash equivalents at end of period	1,602	1,517
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	(184)	255
Cash flows from investing activities:
Purchases of consumer finance receivables, net	0	0
Principal collections and recoveries on consumer finance receivables	0	0
Proceeds from sale of consumer finance receivables, net		0
Net funding of commercial finance receivables	0	0
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Acquisition of international operations	(513)	(46)
Disposition of equity interest	0
Purchases of property and equipment	0	0
Change in restricted cash	0	0
Change in other assets	0	0
Net change in investment in affiliates	(6)	0
Net cash used in investing activities	(519)	(46)
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	6,939	3,500
Payments on unsecured debt	0	0
Net capital contributions	0	26
Debt issuance costs	(47)	(39)
Net change in due from/due to affiliates	(6,189)	(3,696)
Net cash provided by financing activities	703	(209)
Net (decrease) increase in cash and cash equivalents	0	0
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Guarantor [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	314	233
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(8,100)	(4,872)
Principal collections and recoveries on consumer finance receivables	414	(109)
Proceeds from sale of consumer finance receivables, net	5,994	3,319
Net funding of commercial finance receivables	172	160
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Acquisition of international operations	(536)	0
Disposition of equity interest	125
Purchases of property and equipment	(22)	(4)
Change in restricted cash	(20)	1
Change in other assets	0	0
Net change in investment in affiliates	(2,644)	546
Net cash used in investing activities	(4,617)	(959)
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
Net capital contributions	0	0
Debt issuance costs	0	0
Net change in due from/due to affiliates	2,871	1,140
Net cash provided by financing activities	2,871	1,140
Net (decrease) increase in cash and cash equivalents	(1,432)	414
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	2,266	395
Cash and cash equivalents at end of period	834	809
Non-Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	2,037	912
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(10,993)	(9,297)
Principal collections and recoveries on consumer finance receivables	8,304	8,233
Proceeds from sale of consumer finance receivables, net	0	0
Net funding of commercial finance receivables	(351)	(568)
Purchases of leased vehicles, net	(11,258)	(3,227)
Proceeds from termination of leased vehicles	662	395
Acquisition of international operations	0	0
Disposition of equity interest	0
Purchases of property and equipment	(42)	(33)
Change in restricted cash	(216)	(188)
Change in other assets	24	(2)
Net change in investment in affiliates	0	0
Net cash used in investing activities	(13,870)	(4,687)
Cash flows from financing activities:
Net change in debt (original maturities less than three months)	539	(913)
Borrowings and issuance of secured debt	15,095	15,847
Payments on secured debt	(10,903)	(13,568)
Borrowings and issuance of unsecured debt	2,620	1,903
Payments on unsecured debt	(1,195)	(1,339)
Net capital contributions	2,650	(572)
Debt issuance costs	(77)	(68)
Net change in due from/due to affiliates	3,318	2,556
Net cash provided by financing activities	12,047	3,846
Net (decrease) increase in cash and cash equivalents	214	71
Effect of foreign exchange rate changes on cash and cash equivalents	(154)	(42)
Cash and cash equivalents at beginning of period	708	679
Cash and cash equivalents at end of period	768	708
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Purchases of consumer finance receivables, net	5,994	3,319
Principal collections and recoveries on consumer finance receivables	0	0
Proceeds from sale of consumer finance receivables, net	(5,994)	(3,319)
Net funding of commercial finance receivables	0	0
Purchases of leased vehicles, net	0	0
Proceeds from termination of leased vehicles	0	0
Acquisition of international operations	0	0
Disposition of equity interest		0
Purchases of property and equipment	0	0
Change in restricted cash	0	0
Change in other assets	0	0
Net change in investment in affiliates	2,650	(546)
Net cash used in investing activities	2,650	(546)
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
Net capital contributions	(2,650)	546
Debt issuance costs	0	0
Net change in due from/due to affiliates	0	0
Net cash provided by financing activities	(2,650)	546
Net (decrease) increase in cash and cash equivalents	0	0
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0