Consolidated Statements Of Operations - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Vehicle rental									$ 6,081	$ 6,026	$ 6,026
Other									2,578	2,476	2,459
Net revenues									8,659	8,502	8,485
Expenses
Operating									4,382	4,284	4,251
Vehicle depreciation and lease charges, net									2,047	1,933	1,996
Selling, general and administrative									1,134	1,093	1,080
Vehicle interest, net									284	289	282
Non-vehicle related depreciation and amortization									253	218	180
Interest expense related to corporate debt, net:
Interest expense									203	194	209
Early extinguishment of debt									27	23	56
Restructuring expense									29	18	26
Transaction-related costs, net									21	68	13
Total expenses									8,380	8,120	8,093
Income before income taxes									279	382	392
Provision for income taxes									116	69	147
Net income									$ 163	$ 313	$ 245
Earnings per share
Basic	$ (0.35)	$ 2.32	$ 0.39	$ (0.53)	$ (0.06)	$ 1.80	$ 1.36	$ (0.09)	$ 1.78	$ 3.02	$ 2.32
Diluted	$ (0.35)	$ 2.28	$ 0.38	$ (0.53)	$ (0.06)	$ 1.77	$ 1.34	$ (0.09)	$ 1.75	$ 2.98	$ 2.22