Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Sep. 30, 2025	Dec. 31, 2025	Jul. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]
Weighted average rental period				5 days
Net carrying value of software developed		$ 99,000,000		$ 99,000,000	$ 126,000,000
Impairment				$ 0	28,000,000	$ 0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]				Asset impairment charges
Impairment to goodwill					0
Asset impairment charges				$ 518,000,000	2,470,000,000	0
Non-cash impairment					2,300,000,000
Vehicle interest income				13,000,000	12,000,000	34,000,000
Impairment, long-lived asset, held-for-use				0	$ 180,000,000	0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset impairment charges
Advertising expense				94,000,000	$ 77,000,000	86,000,000
Digital marketing cost				95,000,000	90,000,000	86,000,000
Retained risks of liability to third parties		508,000,000		508,000,000	451,000,000
Workers compensation liabilities		46,000,000		$ 46,000,000	50,000,000
Dividend yield				0.00%
Investments in joint ventures		130,000,000		$ 130,000,000	100,000,000
Sale of equity investments				21,000,000	16,000,000	12,000,000
Dividend from equity method investment			$ 7,000,000
Payments to acquire equity method investments		1,000,000
Proceeds from noncontrolling interests	$ 12,000,000			183,000,000	0	0
Contributions from non-controlling interests				183,000,000
Redeemable non-controlling interests		$ 74,000,000		74,000,000	0
Avis Budget Group, Inc.
Summary Of Significant Accounting Policies [Line Items]
Ownership interest	17.00%
Royalty
Summary Of Significant Accounting Policies [Line Items]
Revenue				$ 202,000,000	$ 246,000,000	$ 187,000,000
Customer Loyalty | Maximum
Summary Of Significant Accounting Policies [Line Items]
Term				5 years