Guarantor Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,162,000,000	$ 1,074,000,000	$ 2,897,000,000	$ 1,289,000,000
Finance receivables, net	30,546,000,000	29,282,000,000
Restricted cash	2,101,000,000	1,958,000,000
Property and equipment, net	133,000,000	132,000,000
Leased vehicles, net	3,726,000,000	3,383,000,000
Deferred Tax Assets, Net	440,000,000	359,000,000
Goodwill	1,239,000,000	1,240,000,000
Due from Related Parties	149,000,000	129,000,000
Other assets	413,000,000	433,000,000
Due from Affiliates	0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Assets	39,909,000,000	37,990,000,000
Secured debt	23,386,000,000	22,073,000,000
Unsecured debt	7,172,000,000	6,973,000,000
Accounts payable and accrued expenses	933,000,000	946,000,000
Deferred income	184,000,000	168,000,000
Deferred income taxes	8,000,000	87,000,000
Taxes payable	290,000,000	287,000,000
Related party taxes payable	838,000,000	643,000,000
Related party payable	468,000,000	368,000,000
Other Liabilities	193,000,000	160,000,000
Due to Affiliate	0	0
Liabilities	33,472,000,000	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	4,787,000,000	4,785,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	16,000,000	11,000,000	(9,000,000)
Retained Earnings (Accumulated Deficit)	1,634,000,000	1,489,000,000
Total stockholders' equity	6,437,000,000	6,285,000,000
Total liabilities and shareholder's equity	39,909,000,000	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	25,000,000	1,000,000
Goodwill	1,095,000,000	1,095,000,000
Due from Related Parties	41,000,000	29,000,000
Other assets	81,000,000	74,000,000
Due from Affiliates	3,021,000,000	3,754,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	7,209,000,000	6,994,000,000
Assets	11,472,000,000	11,947,000,000
Unsecured debt	4,000,000,000	4,000,000,000
Accounts payable and accrued expenses	116,000,000	101,000,000
Deferred income	0
Deferred income taxes	0	(28,000,000)
Taxes payable	81,000,000	83,000,000
Related party taxes payable	838,000,000	643,000,000
Related party payable	0
Other Liabilities	0
Due to Affiliate	0	863,000,000
Liabilities	5,035,000,000	5,662,000,000
Additional Paid in Capital, Common Stock	4,787,000,000	4,785,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	16,000,000	11,000,000
Retained Earnings (Accumulated Deficit)	1,634,000,000	1,489,000,000
Total stockholders' equity	6,437,000,000	6,285,000,000
Total liabilities and shareholder's equity	11,472,000,000	11,947,000,000
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	540,000,000	395,000,000	2,834,000,000	1,252,000,000
Finance receivables, net	1,235,000,000	612,000,000
Restricted cash	18,000,000	20,000,000
Property and equipment, net	5,000,000	5,000,000
Leased vehicles, net	0	0
Deferred Tax Assets, Net	(194,000,000)	0
Goodwill	0	0
Due from Related Parties	0	0
Other assets	11,000,000	5,000,000
Due from Affiliates	0	863,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,022,000,000	3,565,000,000
Assets	4,637,000,000	5,465,000,000
Unsecured debt	0	0
Accounts payable and accrued expenses	127,000,000	133,000,000
Deferred income taxes	0	161,000,000
Taxes payable	0	0
Related party taxes payable		0
Other Liabilities	10,000,000	14,000,000
Due to Affiliate	721,000,000	1,474,000,000
Liabilities	858,000,000	1,782,000,000
Additional Paid in Capital, Common Stock	79,000,000	79,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(28,000,000)	(8,000,000)
Retained Earnings (Accumulated Deficit)	3,728,000,000	3,612,000,000
Total stockholders' equity	3,779,000,000	3,683,000,000
Total liabilities and shareholder's equity	4,637,000,000	5,465,000,000
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	622,000,000	679,000,000	62,000,000	37,000,000
Finance receivables, net	29,311,000,000	28,670,000,000
Restricted cash	2,083,000,000	1,938,000,000
Property and equipment, net	128,000,000	127,000,000
Leased vehicles, net	3,726,000,000	3,383,000,000
Deferred Tax Assets, Net	609,000,000	358,000,000
Goodwill	144,000,000	145,000,000
Due from Related Parties	108,000,000	100,000,000
Other assets	324,000,000	358,000,000
Due from Affiliates	0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Assets	37,055,000,000	35,758,000,000
Secured debt	23,386,000,000	22,073,000,000
Unsecured debt	3,172,000,000	2,973,000,000
Accounts payable and accrued expenses	693,000,000	716,000,000
Deferred income	184,000,000	168,000,000
Deferred income taxes	8,000,000	(46,000,000)
Taxes payable	209,000,000	204,000,000
Related party taxes payable	1,000,000	1,000,000
Related party payable	468,000,000	368,000,000
Other Liabilities	183,000,000	146,000,000
Due to Affiliate	2,299,000,000	2,280,000,000
Liabilities	30,603,000,000	28,883,000,000
Common stock, $1.00 par value per share, 1,000 shares authorized and 502 issued	620,000,000	532,000,000
Additional Paid in Capital, Common Stock	3,140,000,000	3,833,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	29,000,000	24,000,000
Retained Earnings (Accumulated Deficit)	2,663,000,000	2,486,000,000
Total stockholders' equity	6,452,000,000	6,875,000,000
Total liabilities and shareholder's equity	37,055,000,000	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	0
Goodwill	0	0
Due from Related Parties	0	0
Other assets	(3,000,000)	(4,000,000)
Due from Affiliates	(3,021,000,000)	(4,617,000,000)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(10,231,000,000)	(10,559,000,000)
Assets	(13,255,000,000)	(15,180,000,000)
Unsecured debt	0	0
Accounts payable and accrued expenses	(3,000,000)	(4,000,000)
Taxes payable	0	0
Related party taxes payable	(1,000,000)	(1,000,000)
Related party payable	0
Other Liabilities	0
Due to Affiliate	(3,020,000,000)	(4,617,000,000)
Liabilities	(3,024,000,000)	(4,622,000,000)
Common stock, $1.00 par value per share, 1,000 shares authorized and 502 issued	(620,000,000)	(532,000,000)
Additional Paid in Capital, Common Stock	(3,219,000,000)	(3,912,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,000,000)	(16,000,000)
Retained Earnings (Accumulated Deficit)	(6,391,000,000)	(6,098,000,000)
Total stockholders' equity	(10,231,000,000)	(10,558,000,000)
Total liabilities and shareholder's equity	$ (13,255,000,000)	$ (15,180,000,000)