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Segment Information (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
Segment Information (Details) $ in Millions	Jul. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 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		$ 2,542	$ 2,575	$ 6,794	$ 6,991
Adjusted Pre-Tax Income (Loss)		212	289	159	368
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		(108)	(256)	3	(185)
Depreciation of revenue earning vehicles and lease charges, net		695	631	1,940	1,859
Assets		21,127		21,127		$ 23,509
Assets of discontinued operations		$ 0		$ 0		3,390
7.50% Senior Notes due October 2018
Adjustments from Segment Totals to Consolidated [Abstract]
Redemption premium	$ 13
Interest rate (as a percentage)	7.50%	7.50%		7.50%
European Fleet Notes
Adjustments from Segment Totals to Consolidated [Abstract]
Interest rate (as a percentage)		4.125%		4.125%
Acquisition accounting
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		$ 16	23	$ 49	66
Debt-related charges
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		11	14	36	44
Loss On Extinguishment of Debt [Member]
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		(20)	0	(40)	0
Restructuring and restructuring related charges
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		11	15	41	77
Sale of CAR, Inc. Common Stock
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		0	(56)	(75)	(56)
Impairment charges and asset write-downs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		28	6	31	15
Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		14	0	40	0
Other
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		4	31	0	37
U.S. Rental Car
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net		462	399	1,298	1,200
U.S. Rental Car \| Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		(2)		(11)
International Rental Car
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net		116	114	300	310
All Other Operations
Adjustments from Segment Totals to Consolidated [Abstract]
Depreciation of revenue earning vehicles and lease charges, net		117	118	342	349
All Other Operations \| Finance and Information Technology Transformation Costs
Adjustments from Segment Totals to Consolidated [Abstract]
Adjusted pre-tax income		(12)		(29)
Operating segments
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues		2,542	2,575	6,794	6,991
Adjusted Pre-Tax Income (Loss)		334	415	544	764
Operating segments \| U.S. Rental Car
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues		1,707	1,739	4,697	4,873
Adjusted Pre-Tax Income (Loss)		173	246	312	509
Adjustments from Segment Totals to Consolidated [Abstract]
Assets		13,035		13,035		13,614
Operating segments \| International Rental Car
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues		683	687	1,656	1,679
Adjusted Pre-Tax Income (Loss)		142	151	179	203
Adjustments from Segment Totals to Consolidated [Abstract]
Assets		4,493		4,493		3,002
Operating segments \| All Other Operations
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Revenues		152	149	441	439
Adjusted Pre-Tax Income (Loss)		19	18	53	52
Adjustments from Segment Totals to Consolidated [Abstract]
Assets		1,608		1,608		1,520
Corporate, Non-Segment
Reconciliation of adjusted pre-tax income to income (loss) before income taxes
Adjusted Pre-Tax Income (Loss)		(122)	$ (126)	(385)	$ (396)
Adjustments from Segment Totals to Consolidated [Abstract]
Assets		$ 1,991		$ 1,991		$ 1,983