Guarantor Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,412,000,000	$ 1,412,000,000	$ 1,074,000,000	$ 1,757,000,000	$ 1,289,000,000
Finance receivables, net	31,545,000,000		29,282,000,000
Restricted cash	2,205,000,000		1,958,000,000
Property and equipment, net	150,000,000		132,000,000
Leased vehicles, net	4,748,000,000		3,383,000,000
Deferred Tax Assets, Net	433,000,000		359,000,000
Goodwill	1,245,000,000		1,240,000,000
Due from Related Parties	185,000,000		129,000,000
Other assets	436,000,000		433,000,000
Due from Affiliates	0		0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0		0
Total assets	42,359,000,000		37,990,000,000
Secured debt	25,006,000,000		22,073,000,000
Unsecured debt	7,596,000,000		6,973,000,000
Accounts payable and accrued expenses	984,000,000		946,000,000
Deferred income	249,000,000		168,000,000
Deferred income taxes	12,000,000		87,000,000
Taxes payable	293,000,000		287,000,000
Related party taxes payable	891,000,000		643,000,000
Related party payable	432,000,000		368,000,000
Other Liabilities	229,000,000		160,000,000
Due to Affiliate	0		0
Total liabilities	35,692,000,000		31,705,000,000
Common stock, $1.00 par value per share, 1,000 shares authorized and 502 issued	0		0
Additional Paid in Capital, Common Stock	4,793,000,000		4,785,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	65,000,000		11,000,000	(68,000,000)
Retained Earnings (Accumulated Deficit)	1,809,000,000		1,489,000,000
Total stockholders' equity	6,667,000,000		6,285,000,000
Total liabilities and shareholder's equity	42,359,000,000		37,990,000,000
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0		0	0	0
Finance receivables, net	0		0
Restricted cash	0		0
Property and equipment, net	0		0
Leased vehicles, net	0		0
Deferred Tax Assets, Net	20,000,000		1,000,000
Goodwill	1,095,000,000		1,095,000,000
Due from Related Parties	0		29,000,000
Other assets	62,000,000		74,000,000
Due from Affiliates	3,116,000,000		3,754,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	7,388,000,000		6,994,000,000
Total assets	11,681,000,000		11,947,000,000
Unsecured debt	4,000,000,000		4,000,000,000
Accounts payable and accrued expenses	49,000,000		101,000,000
Deferred income	0
Deferred income taxes	0		(28,000,000)
Taxes payable	74,000,000		83,000,000
Related party taxes payable	891,000,000		643,000,000
Related party payable	0
Other Liabilities	0
Due to Affiliate	0		863,000,000
Total liabilities	5,014,000,000		5,662,000,000
Additional Paid in Capital, Common Stock	4,793,000,000		4,785,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	65,000,000		11,000,000
Retained Earnings (Accumulated Deficit)	1,809,000,000		1,489,000,000
Total stockholders' equity	6,667,000,000		6,285,000,000
Total liabilities and shareholder's equity	11,681,000,000		11,947,000,000
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	699,000,000		395,000,000	1,053,000,000	1,252,000,000
Finance receivables, net	609,000,000		612,000,000
Restricted cash	30,000,000		20,000,000
Property and equipment, net	6,000,000		5,000,000
Leased vehicles, net	0		0
Deferred Tax Assets, Net	0		0
Goodwill	0		0
Due from Related Parties	18,000,000		0
Other assets	2,000,000		5,000,000
Due from Affiliates	0		863,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,594,000,000		3,565,000,000
Total assets	4,958,000,000		5,465,000,000
Unsecured debt	0		0
Accounts payable and accrued expenses	137,000,000		133,000,000
Deferred income taxes	199,000,000		161,000,000
Taxes payable	0		0
Related party taxes payable			0
Other Liabilities	18,000,000		14,000,000
Due to Affiliate	677,000,000		1,474,000,000
Total liabilities	1,031,000,000		1,782,000,000
Additional Paid in Capital, Common Stock	79,000,000		79,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,000,000)		(8,000,000)
Retained Earnings (Accumulated Deficit)	3,853,000,000		3,612,000,000
Total stockholders' equity	3,927,000,000		3,683,000,000
Total liabilities and shareholder's equity	4,958,000,000		5,465,000,000
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	713,000,000		679,000,000	704,000,000	37,000,000
Finance receivables, net	30,936,000,000		28,670,000,000
Restricted cash	2,175,000,000		1,938,000,000
Property and equipment, net	144,000,000		127,000,000
Leased vehicles, net	4,748,000,000		3,383,000,000
Deferred Tax Assets, Net	612,000,000		358,000,000
Goodwill	150,000,000		145,000,000
Due from Related Parties	167,000,000		100,000,000
Other assets	377,000,000		358,000,000
Due from Affiliates	0		0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0		0
Total assets	40,022,000,000		35,758,000,000
Secured debt	25,006,000,000		22,073,000,000
Unsecured debt	3,596,000,000		2,973,000,000
Accounts payable and accrued expenses	803,000,000		716,000,000
Deferred income	249,000,000		168,000,000
Deferred income taxes	12,000,000		(46,000,000)
Taxes payable	219,000,000		204,000,000
Related party taxes payable	1,000,000		1,000,000
Related party payable	432,000,000		368,000,000
Other Liabilities	211,000,000		146,000,000
Due to Affiliate	2,438,000,000		2,280,000,000
Total liabilities	32,967,000,000		28,883,000,000
Common stock, $1.00 par value per share, 1,000 shares authorized and 502 issued	698,000,000		532,000,000
Additional Paid in Capital, Common Stock	3,400,000,000		3,833,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	81,000,000		24,000,000
Retained Earnings (Accumulated Deficit)	2,876,000,000		2,486,000,000
Total stockholders' equity	7,055,000,000		6,875,000,000
Total liabilities and shareholder's equity	40,022,000,000		35,758,000,000
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0		0		0
Finance receivables, net	0		0
Restricted cash	0		0
Property and equipment, net	0		0
Leased vehicles, net	0		0
Deferred Tax Assets, Net	(199,000,000)
Goodwill	0		0
Due from Related Parties	0		0
Other assets	(5,000,000)		(4,000,000)
Due from Affiliates	(3,116,000,000)		(4,617,000,000)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(10,982,000,000)		(10,559,000,000)
Total assets	(14,302,000,000)		(15,180,000,000)
Unsecured debt	0		0
Accounts payable and accrued expenses	(5,000,000)		(4,000,000)
Deferred income taxes	(199,000,000)
Taxes payable	0		0
Related party taxes payable	(1,000,000)		(1,000,000)
Related party payable	0
Other Liabilities	0
Due to Affiliate	(3,115,000,000)		(4,617,000,000)
Total liabilities	(3,320,000,000)		(4,622,000,000)
Common stock, $1.00 par value per share, 1,000 shares authorized and 502 issued	(698,000,000)		(532,000,000)
Additional Paid in Capital, Common Stock	(3,479,000,000)		(3,912,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(76,000,000)		(16,000,000)
Retained Earnings (Accumulated Deficit)	(6,729,000,000)		(6,098,000,000)
Total stockholders' equity	(10,982,000,000)		(10,558,000,000)
Total liabilities and shareholder's equity	$ (14,302,000,000)		$ (15,180,000,000)