Basis of Presentation - Narrative (Details) - USD ($) $ in Millions			1 Months Ended		3 Months Ended
	Dec. 30, 2025	Sep. 30, 2025	Jan. 31, 2026	Dec. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Proceeds from noncontrolling interests		$ 12
Distributions	$ 183
Redeemable non-controlling interests				$ 74	$ 120
Investments				130	121
Income from equity method investments					1	$ 2
Dividend from equity method investment			$ 8
Payments to acquire equity method investments				$ 1
Avis Budget Group, Inc.
Debt Instrument [Line Items]
Ownership interest		17.00%
Royalty fee
Debt Instrument [Line Items]
Revenue					$ 46	$ 45