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Other Expenses and Charges - Narrative (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2026 USD ($)	Mar. 31, 2026 employee	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)
Restructuring Cost and Reserve [Line Items]
Transaction-related	$ 0		$ 1	$ 3	$ 2
Restructuring and other-related	2		2	12	16
Separation-related	$ 0		0	$ (1)	1
Senior Unsecured Notes due March 2033 \| Senior Notes
Restructuring Cost and Reserve [Line Items]
Debt instrument, interest rate, stated percentage	5.625%			5.625%
2025 Global Cost Basis and Streamlining Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other-related			$ 2	$ 4	$ 16
Hotel Franchising Segment
Restructuring Cost and Reserve [Line Items]
Restructuring and other-related				$ 3
Hotel Franchising Segment \| 2025 Global Cost Basis and Streamlining Plan
Restructuring Cost and Reserve [Line Items]
Number of employees impacted \| employee		202