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Segment Information (Details) $ in Millions	3 Months Ended			6 Months Ended
Segment Information (Details) $ in Millions	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Number of reportable segments \| segment				3
Revenues	$ 2,270	$ 2,317		$ 4,253	$ 4,415
Adjusted Pre-Tax Income (Loss)	55	118		(53)	77
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	35	(38)		112	71
Depreciation of revenue earning vehicles and lease charges, net	629	597		1,245	1,228
Assets	22,020			22,020		$ 23,509
Assets of discontinued operations	0			0		3,390
Impairment charges and asset write-downs				3	20
Acquisition accounting
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	18	23		34	45
Debt-related charges
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	12	15		25	29
Loss On Extinguishment of Debt [Member]
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	(20)	0		(20)	0
Restructuring and restructuring related charges
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	18	41		29	59
Sale of CAR, Inc. Common Stock
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income				(75)	0
Impairment charges and asset write-downs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	3	0		3	9
Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	19	0		26	0
Other
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	0	1		(3)	6
Selling, general and administrative expenses \| Held-for-sale \| Dollar Thrifty Headquarters
Adjustments from Segment Totals to Consolidated [Abstract]
Impairment charges and asset write-downs			$ 6
U.S. Rental Car
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net	417	380		836	801
U.S. Rental Car \| Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	(5)			(9)
International Rental Car
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net	98	101		184	196
All Other Operations
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net	114	116		225	231
All Other Operations \| Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income	(14)			(17)
Operating segments
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues	2,270	2,317		4,253	4,415
Adjusted Pre-Tax Income (Loss)	194	257		209	348
Operating segments \| U.S. Rental Car
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues	1,584	1,615		2,990	3,135
Adjusted Pre-Tax Income (Loss)	143	195		138	265
Adjustments from Segment Totals to Consolidated [Abstract]
Assets	14,049			14,049		13,614
Operating segments \| International Rental Car
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues	540	556		973	992
Adjusted Pre-Tax Income (Loss)	34	45		36	52
Adjustments from Segment Totals to Consolidated [Abstract]
Assets	4,416			4,416		3,002
Operating segments \| All Other Operations
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues	146	146		290	288
Adjusted Pre-Tax Income (Loss)	17	17		35	31
Adjustments from Segment Totals to Consolidated [Abstract]
Assets	1,583			1,583		1,520
Corporate, Non-Segment
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Adjusted Pre-Tax Income (Loss)	(139)	$ (139)		(262)	$ (271)
Adjustments from Segment Totals to Consolidated [Abstract]
Assets	$ 1,972			$ 1,972		$ 1,983