Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income (loss)	$ (684)	$ 302	$ 165
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Vehicle depreciation	1,330	1,890	1,974
Amortization of Right-Of-Use Assets	945	989	0
(Gain) loss on sale of vehicles, net	(157)	(82)	(48)
Non-vehicle related depreciation and amortization	286	263	256
Deferred income taxes	(317)	(103)	14
Stock-based compensation	9	22	24
Amortization of debt financing fees	33	31	28
Early extinguishment of debt costs	9	12	19
Net change in assets and liabilities, excluding the impact of acquisitions and dispositions:
Receivables	115	10	(44)
Income taxes	1	(5)	35
Accounts payable and other current liabilities	(181)	84	48
Increase (Decrease) in Operating Liabilities	(936)	(981)	0
Other, net	238	154	138
Net cash provided by operating activities	691	2,586	2,609
Investing activities
Property and equipment additions	(94)	(250)	(231)
Proceeds received on asset sales	6	11	17
Net assets acquired (net of cash acquired)	(69)	(77)	(91)
Other, net	0	81	(44)
Net cash used in investing activities exclusive of vehicle programs	(157)	(235)	(349)
Vehicle programs:
Investment in vehicles	(5,401)	(12,887)	(12,589)
Proceeds received on disposition of vehicles	8,753	10,460	9,648
Repayments of Related Party Debt	(286)	(251)	(188)
Proceeds from Related Party Debt	268	161	52
Net Cash Used In Investing Activities Of Vehicle Programs	3,334	(2,517)	(3,077)
Net cash provided by (used in) investing activities	3,177	(2,752)	(3,426)
Financing activities
Proceeds from long-term borrowings	991	402	485
Payments on long-term borrowings	(308)	(509)	(515)
Net change in short-term borrowings	0	(1)	(4)
Debt financing fees	(26)	(7)	(15)
Repurchases of common stock	(119)	(67)	(216)
Other, net	0	0	3
Net cash provided by (used in) financing activities exclusive of vehicle programs	553	(182)	(262)
Vehicle programs:
Proceeds from borrowings	13,558	19,869	17,339
Payments on borrowings	(18,138)	(19,346)	(16,385)
Debt financing fees	(18)	(23)	(25)
Net cash provided by financing activities of vehicle programs	(4,598)	500	929
Net cash provided by (used in) financing activities	(4,045)	318	667
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	42	13	(16)
Net (decrease) increase in cash and cash equivalents, program and restricted cash	(135)	165	(166)
Cash and cash equivalents, program and restricted cash, beginning of period	900	735	901
Cash and cash equivalents, program and restricted cash, end of period	765	900	735
Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	503	509	497
Income Taxes Paid, Net [Abstract]
Income tax payments, net	44	93	53
Proceeds from Issuance of Common Stock	$ 15	$ 0	$ 0