Segment Information (Summary of Net Revenues and Adjusted EBITDA by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net Revenues	$ 305	$ 313
Adjusted EBITDA	141	147
Reportable Segments | Hotel Franchising
Segment Reporting Information [Line Items]
Net Revenues	305	313
Adjusted EBITDA	158	164
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net Revenues	0	0
Adjusted EBITDA	$ (17)	$ (17)