v3.26.1
SEGMENT INFORMATION - Schedule of Summarized Consolidated Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting        
Total revenues $ 1,829 $ 1,808 $ 3,577 $ 3,526
Segment revenues        
Segment Reporting        
Total revenues 823 878 1,649 1,730
Gross fees        
Segment Reporting        
Total revenues 324 301 657 608
Base management fees        
Segment Reporting        
Total revenues 124 113 251 227
Incentive management fees        
Segment Reporting        
Total revenues 64 62 150 138
Franchise and other fees        
Segment Reporting        
Total revenues 136 126 256 243
Owned and leased        
Segment Reporting        
Total revenues 274 304 493 523
Rooms and packages        
Segment Reporting        
Total revenues 186 218 328 362
Food and beverage        
Segment Reporting        
Total revenues 55 53 103 99
Other        
Segment Reporting        
Total revenues 33 33 62 62
Distribution        
Segment Reporting        
Total revenues 225 262 499 577
Other revenues        
Segment Reporting        
Total revenues 0 11 0 22
Contra revenue        
Segment Reporting        
Total revenues (17) (15) (40) (35)
Revenues for reimbursed costs        
Segment Reporting        
Total revenues 1,023 945 1,968 1,831
Operating Segments        
Segment Reporting        
Total revenues 1,844 1,824 3,605 3,555
Operating Segments | Management and franchising        
Segment Reporting        
Total revenues 1,340 1,253 2,604 2,446
Operating Segments | Owned and leased        
Segment Reporting        
Total revenues 279 309 502 532
Operating Segments | Distribution        
Segment Reporting        
Total revenues 225 262 499 577
Operating Segments | Segment revenues        
Segment Reporting        
Total revenues 838 894 1,677 1,759
Operating Segments | Segment revenues | Management and franchising        
Segment Reporting        
Total revenues 334 323 676 650
Operating Segments | Segment revenues | Owned and leased        
Segment Reporting        
Total revenues 279 309 502 532
Operating Segments | Segment revenues | Distribution        
Segment Reporting        
Total revenues 225 262 499 577
Operating Segments | Gross fees        
Segment Reporting        
Total revenues 334 312 676 628
Operating Segments | Gross fees | Management and franchising        
Segment Reporting        
Total revenues 334 312 676 628
Operating Segments | Gross fees | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Gross fees | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Base management fees        
Segment Reporting        
Total revenues 131 120 264 240
Operating Segments | Base management fees | Management and franchising        
Segment Reporting        
Total revenues 131 120 264 240
Operating Segments | Base management fees | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Base management fees | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Incentive management fees        
Segment Reporting        
Total revenues 66 64 153 141
Operating Segments | Incentive management fees | Management and franchising        
Segment Reporting        
Total revenues 66 64 153 141
Operating Segments | Incentive management fees | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Incentive management fees | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Franchise and other fees        
Segment Reporting        
Total revenues 137 128 259 247
Operating Segments | Franchise and other fees | Management and franchising        
Segment Reporting        
Total revenues 137 128 259 247
Operating Segments | Franchise and other fees | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Franchise and other fees | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Owned and leased        
Segment Reporting        
Total revenues 279 309 502 532
Operating Segments | Owned and leased | Management and franchising        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Owned and leased | Owned and leased        
Segment Reporting        
Total revenues 279 309 502 532
Operating Segments | Owned and leased | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Rooms and packages        
Segment Reporting        
Total revenues 191 223 337 371
Operating Segments | Rooms and packages | Management and franchising        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Rooms and packages | Owned and leased        
Segment Reporting        
Total revenues 191 223 337 371
Operating Segments | Rooms and packages | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Food and beverage        
Segment Reporting        
Total revenues 55 53 103 99
Operating Segments | Food and beverage | Management and franchising        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Food and beverage | Owned and leased        
Segment Reporting        
Total revenues 55 53 103 99
Operating Segments | Food and beverage | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Other        
Segment Reporting        
Total revenues 33 33 62 62
Operating Segments | Other | Management and franchising        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Other | Owned and leased        
Segment Reporting        
Total revenues 33 33 62 62
Operating Segments | Other | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Distribution        
Segment Reporting        
Total revenues 225 262 499 577
Operating Segments | Distribution | Management and franchising        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Distribution | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Distribution | Distribution        
Segment Reporting        
Total revenues 225 262 499 577
Operating Segments | Other revenues        
Segment Reporting        
Total revenues   11   22
Operating Segments | Other revenues | Management and franchising        
Segment Reporting        
Total revenues   11   22
Operating Segments | Other revenues | Owned and leased        
Segment Reporting        
Total revenues   0   0
Operating Segments | Other revenues | Distribution        
Segment Reporting        
Total revenues   0   0
Operating Segments | Contra revenue        
Segment Reporting        
Total revenues (17) (15) (40) (35)
Operating Segments | Contra revenue | Management and franchising        
Segment Reporting        
Total revenues (17) (15) (40) (35)
Operating Segments | Contra revenue | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Contra revenue | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Revenues for reimbursed costs        
Segment Reporting        
Total revenues 1,023 945 1,968 1,831
Operating Segments | Revenues for reimbursed costs | Management and franchising        
Segment Reporting        
Total revenues 1,023 945 1,968 1,831
Operating Segments | Revenues for reimbursed costs | Owned and leased        
Segment Reporting        
Total revenues 0 0 0 0
Operating Segments | Revenues for reimbursed costs | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations        
Segment Reporting        
Total revenues (15) (16) (28) (29)
Eliminations | Management and franchising        
Segment Reporting        
Total revenues (10) (11) (19) (20)
Eliminations | Owned and leased        
Segment Reporting        
Total revenues (5) (5) (9) (9)
Eliminations | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations | Segment revenues        
Segment Reporting        
Total revenues (15) (16) (28) (29)
Eliminations | Gross fees        
Segment Reporting        
Total revenues (10) (11) (19) (20)
Eliminations | Base management fees        
Segment Reporting        
Total revenues (7) (7) (13) (13)
Eliminations | Incentive management fees        
Segment Reporting        
Total revenues (2) (2) (3) (3)
Eliminations | Franchise and other fees        
Segment Reporting        
Total revenues (1) (2) (3) (4)
Eliminations | Owned and leased        
Segment Reporting        
Total revenues (5) (5) (9) (9)
Eliminations | Rooms and packages        
Segment Reporting        
Total revenues (5) (5) (9) (9)
Eliminations | Food and beverage        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations | Other        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations | Distribution        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations | Other revenues        
Segment Reporting        
Total revenues   0   0
Eliminations | Contra revenue        
Segment Reporting        
Total revenues 0 0 0 0
Eliminations | Revenues for reimbursed costs        
Segment Reporting        
Total revenues $ 0 $ 0 $ 0 $ 0