Guarantor Condensed Consolidating Financial Statements Guarantor Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 1,265	$ 846
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(8,366)	(6,827)
Principal collections and recoveries on consumer finance receivables	5,716	5,300
Proceeds from sale of consumer finance receivables, net	0	0
Net funding of commercial finance receivables	(37)	(239)
Purchases of leased vehicles, net	(6,724)	(1,856)
Proceeds from termination of leased vehicles	468	264
Acquisition of international operations	(1,049)	(46)
Disposition of equity interest	125
Purchases of property and equipment	(44)	(15)
Change in restricted cash	(140)	(236)
Change in other assets	17	(2)
Net change in investment in affiliates	0	0
Net cash used in investing activities	(10,034)	(3,657)
Cash flows from financing activities:
Net change in debt (original maturities less than three months)	(150)	278
Borrowings and issuance of secured debt	9,791	10,722
Payments on secured debt	(7,406)	(8,445)
Borrowings and issuance of unsecured debt	6,697	1,472
Payments on unsecured debt	(871)	(838)
Net capital contributions	0	0
Debt issuance costs	(101)	(49)
Net change in due from/due to affiliates	0	0
Net cash provided by financing activities	7,960	3,140
Net (decrease) increase in cash and cash equivalents	(809)	329
Effect of foreign exchange rate changes on cash and cash equivalents	(95)	9
Cash and cash equivalents at beginning of period	2,974	1,074
Cash and cash equivalents at end of period	2,070	1,412
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	(102)	205
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)	(5)
Net cash used in investing activities	(519)	(51)
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	4,640	0
Payments on unsecured debt	0	0
Net capital contributions	0	26
Debt issuance costs	(36)	0
Net change in due from/due to affiliates	(3,983)	(180)
Net cash provided by financing activities	621	(154)
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	150	141
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(4,923)	(2,924)
Principal collections and recoveries on consumer finance receivables	246	(100)
Proceeds from sale of consumer finance receivables, net	2,619	2,643
Net funding of commercial finance receivables	139	256
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	(12)	(2)
Change in restricted cash	(13)	(9)
Change in other assets	0	0
Net change in investment in affiliates	(355)	243
Net cash used in investing activities	(2,710)	107
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	1,455	56
Net cash provided by financing activities	1,455	56
Net (decrease) increase in cash and cash equivalents	(1,105)	304
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	1,161	699
Non-Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	1,217	500
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(6,062)	(6,546)
Principal collections and recoveries on consumer finance receivables	5,470	5,400
Proceeds from sale of consumer finance receivables, net	0	0
Net funding of commercial finance receivables	(176)	(495)
Purchases of leased vehicles, net	(6,724)	(1,856)
Proceeds from termination of leased vehicles	468	264
Acquisition of international operations	0	0
Disposition of equity interest	0
Purchases of property and equipment	(32)	(13)
Change in restricted cash	(127)	(227)
Change in other assets	17	(2)
Net change in investment in affiliates	0	0
Net cash used in investing activities	(7,166)	(3,475)
Cash flows from financing activities:
Net change in debt (original maturities less than three months)	(150)	278
Borrowings and issuance of secured debt	9,791	10,722
Payments on secured debt	(7,406)	(8,445)
Borrowings and issuance of unsecured debt	2,057	1,472
Payments on unsecured debt	(871)	(838)
Net capital contributions	361	(264)
Debt issuance costs	(65)	(49)
Net change in due from/due to affiliates	2,528	124
Net cash provided by financing activities	6,245	3,000
Net (decrease) increase in cash and cash equivalents	296	25
Effect of foreign exchange rate changes on cash and cash equivalents	(95)	9
Cash and cash equivalents at beginning of period	708	679
Cash and cash equivalents at end of period	909	713
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	2,619	2,643
Principal collections and recoveries on consumer finance receivables	0	0
Proceeds from sale of consumer finance receivables, net	(2,619)	(2,643)
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	361	(238)
Net cash used in investing activities	361	(238)
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	(361)	238
Debt issuance costs	0	0
Net change in due from/due to affiliates	0	0
Net cash provided by financing activities	(361)	238
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