REVENUE FROM CONTRACTS WITH CUSTOMERS- Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | $ 663 | $ 250 | $ 1,101 | $ 1,243 |
Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 114 | 7 | 173 | 185 |
Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 43 | 3 | 63 | 108 |
Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 34 | 9 | 59 | 49 |
Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 191 | 19 | 295 | 342 |
Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 36 | 8 | 60 | 55 |
Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 12 | (2) | 20 | 6 |
Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 29 | 6 | 46 | 33 |
Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 16 | 8 | 30 | 34 |
Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 93 | 20 | 156 | 128 |
Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (9) | (7) | (17) | (13) |
Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 84 | 13 | 139 | 115 |
Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 22 | 3 | 41 | 38 |
Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 366 | 215 | 626 | 748 |
Operating segments | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 194 | 20 | 301 | 350 |
Operating segments | Owned and leased hotels | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 117 | 8 | 179 | 193 |
Operating segments | Owned and leased hotels | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 43 | 3 | 63 | 108 |
Operating segments | Owned and leased hotels | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 34 | 9 | 59 | 49 |
Operating segments | Owned and leased hotels | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 194 | 20 | 301 | 350 |
Operating segments | Owned and leased hotels | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Owned and leased hotels | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Americas management and franchising | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 407 | 192 | 685 | 783 |
Operating segments | Americas management and franchising | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Americas management and franchising | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Americas management and franchising | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Americas management and franchising | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | Americas management and franchising | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 30 | 4 | 46 | 48 |
Operating segments | Americas management and franchising | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 4 | (3) | 5 | 1 |
Operating segments | Americas management and franchising | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 28 | 5 | 45 | 32 |
Operating segments | Americas management and franchising | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 4 | 2 | 8 | 11 |
Operating segments | Americas management and franchising | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 66 | 8 | 104 | 92 |
Operating segments | Americas management and franchising | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (5) | (4) | (9) | (8) |
Operating segments | Americas management and franchising | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 61 | 4 | 95 | 84 |
Operating segments | Americas management and franchising | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 19 | 2 | 36 | 29 |
Operating segments | Americas management and franchising | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 327 | 186 | 554 | 670 |
Operating segments | ASPAC management and franchising | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 43 | 22 | 77 | 67 |
Operating segments | ASPAC management and franchising | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | ASPAC management and franchising | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | ASPAC management and franchising | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | ASPAC management and franchising | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | ASPAC management and franchising | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 9 | 3 | 17 | 9 |
Operating segments | ASPAC management and franchising | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 6 | 0 | 11 | 3 |
Operating segments | ASPAC management and franchising | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 1 | 1 | 1 | 1 |
Operating segments | ASPAC management and franchising | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 4 | 2 | 6 | 12 |
Operating segments | ASPAC management and franchising | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 20 | 6 | 35 | 25 |
Operating segments | ASPAC management and franchising | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (1) | (1) | (2) | (2) |
Operating segments | ASPAC management and franchising | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 19 | 5 | 33 | 23 |
Operating segments | ASPAC management and franchising | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | ASPAC management and franchising | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 24 | 17 | 44 | 44 |
Operating segments | EAME/SW Asia management and franchising | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 18 | 12 | 35 | 41 |
Operating segments | EAME/SW Asia management and franchising | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 3 | 1 | 6 | 8 |
Operating segments | EAME/SW Asia management and franchising | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 3 | 0 | 5 | 2 |
Operating segments | EAME/SW Asia management and franchising | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 1 | 2 | 2 |
Operating segments | EAME/SW Asia management and franchising | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 6 | 2 | 13 | 12 |
Operating segments | EAME/SW Asia management and franchising | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (3) | (2) | (6) | (3) |
Operating segments | EAME/SW Asia management and franchising | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 3 | 0 | 7 | 9 |
Operating segments | EAME/SW Asia management and franchising | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Operating segments | EAME/SW Asia management and franchising | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 15 | 12 | 28 | 32 |
Corporate and other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 11 | 4 | 19 | 20 |
Corporate and other | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 8 | 3 | 14 | 9 |
Corporate and other | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 8 | 3 | 14 | 9 |
Corporate and other | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Corporate and other | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 8 | 3 | 14 | 9 |
Corporate and other | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 3 | 1 | 5 | 9 |
Corporate and other | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 2 |
Eliminations | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (10) | 0 | (16) | (18) |
Eliminations | Rooms revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (3) | (1) | (6) | (8) |
Eliminations | Food and beverage | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (3) | (1) | (6) | (8) |
Eliminations | Base management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (6) | 0 | (9) | (10) |
Eliminations | Incentive management fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (1) | 1 | (1) | 0 |
Eliminations | Franchise fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (7) | 1 | (10) | (10) |
Eliminations | Contra revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Net management, franchise, and other fees | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | (7) | 1 | (10) | (10) |
Eliminations | Other revenues | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Revenues for the reimbursement of costs incurred on behalf of managed and franchised properties | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 0 | 0 | 0 | 0 |
Eliminations | Owned and leased hotels | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 3 | 1 | 6 | 8 |
Eliminations | Americas management and franchising | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | 7 | (1) | 10 | 9 |
Eliminations | EAME/SW Asia management and franchising | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenues | $ 0 | $ 0 | $ 0 | $ 1 |