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Revenue - Summary of Group Revenue Disaggregated By Type of Revenue Stream and By Reportable Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from insurance activities $ 27 $ 23 $ 21
Revenues, before system fund and reimbursable revenues 2,468 2,312 2,164
System Fund revenues (note 31) 1,717 1,611 1,564
Reimbursable revenues (note 31) 1,004 1,000 896
Total revenue 5,189 4,923 4,624
Franchise and base management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,371 1,357 1,304
Incentive management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 190 178 168
Central revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 336 239 200
Revenue from fee business      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,897 1,774 1,672
Revenue from owned & leased hotels      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 544 515 471
Americas      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from insurance activities 0 0 0
Revenues, before system fund and reimbursable revenues 1,129 1,141 1,105
Americas | Franchise and base management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 943 958 936
Americas | Incentive management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 20 21 21
Americas | Central revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Americas | Revenue from fee business      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 963 979 957
Americas | Revenue from owned & leased hotels      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 166 162 148
EMEAA      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from insurance activities 0 0 0
Revenues, before system fund and reimbursable revenues 811 748 677
EMEAA | Franchise and base management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 299 277 253
EMEAA | Incentive management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 134 118 101
EMEAA | Central revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
EMEAA | Revenue from fee business      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 433 395 354
EMEAA | Revenue from owned & leased hotels      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 378 353 323
Greater China      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from insurance activities 0 0 0
Revenues, before system fund and reimbursable revenues 165 161 161
Greater China | Franchise and base management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 129 122 115
Greater China | Incentive management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 36 39 46
Greater China | Central revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Greater China | Revenue from fee business      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 165 161 161
Greater China | Revenue from owned & leased hotels      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Central      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from insurance activities 27 23 21
Revenues, before system fund and reimbursable revenues 363 262 221
Central | Franchise and base management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Central | Incentive management fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Central | Central revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 336 239 200
Central | Revenue from fee business      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 336 239 200
Central | Revenue from owned & leased hotels      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 0 $ 0 $ 0