Other Expenses and Charges - Narrative (Details) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Jun. 30, 2026
USD ($)
|
Jun. 30, 2025
USD ($)
|
Jun. 30, 2026
USD ($)
|
Jun. 30, 2025
USD ($)
|
Dec. 31, 2025
employee
|
|
| Restructuring Cost and Reserve [Line Items] | |||||
| Transaction-related | $ 0 | $ 1 | $ 3 | $ 1 | |
| Restructuring and other-related | 5 | 13 | 10 | 13 | |
| Separation-related | 0 | $ 1 | 0 | ||
| Separation-Related Charges | $ 0 | 0 | |||
| 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 | $ 1 | $ 13 | $ 4 | $ 13 | |
| 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 | ||||
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The number of positions eliminated during the period as a result of restructuring activities. No definition available.
|
| X | ||||||||||
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Separation-Related Charges No definition available.
|
| X | ||||||||||
- Definition Separation-Related Income Associated With Expiration Of Tax Matter No definition available.
|
| X | ||||||||||
- Definition Transaction Related Costs No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|