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DEBT AND EQUITY SECURITIES - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2024 shares | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Feb. 27, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | $ 221 |  | $ 221 |  | $ 189 |
Other long-term liabilities |  | 1,912 |  | 1,912 |  | 1,810 |
HTM debt securities |  | 287 |  | 287 |  | 267 |
Held-to-maturity securities, fair value |  | 286 |  | 286 |  | 270 |
Equity securities without a readily determinable fair value |  | 11 |  | 11 |  | 12 |
Held for Operating Programs |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Amortized cost |  | 572 |  | 572 |  | 473 |
Equity securities |  | 19 |  | 19 |  | 17 |
World of Hyatt | Held for Operating Programs | Affiliated Entity |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
HTM debt securities |  | 68 |  | 68 |  | 25 |
IPO | Unconsolidated Hospitality Ventures |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of shares issued (in shares) | shares | 50,000,000 |  |  |  |  |  |
Guarantee Type, Other |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Maximum potential future payments |  | 141 |  | 141 |  | $ 142 |
Unlimited Vacation Club |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  |  | $ 20 |  | $ 20 |  |
Gain on dilution |  |  |  |  | 79 |  |
Unlimited Vacation Club | Level Three - Significant Unobservable Inputs |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, liability, current carrying value |  |  | 86 |  | 86 |  |
Unlimited Vacation Club | Level Three - Significant Unobservable Inputs | Partner's Investment Guarantee |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, liability, current carrying value |  |  | 25 |  | 25 |  |
Maximum potential future payments |  |  | 70 |  | 70 |  |
Unlimited Vacation Club | Level Three - Significant Unobservable Inputs | Tax Obligation Guarantee |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, liability, current carrying value |  |  | 61 |  | 61 |  |
Unconsolidated Hospitality Ventures |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | 291 |  | 291 |  |  |
Equity method investment, impairment charges |  | 6 | 10 | 7 | $ 10 |  |
Number of shares owned (in shares) | shares | 86,251,192 |  |  |  |  |  |
Equity method investment, ownership percentage | 38.80% |  |  |  |  |  | 50.00%
Unconsolidated Hospitality Ventures | Level Three - Significant Unobservable Inputs | Tax Obligation Guarantee |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Maximum potential future payments |  | 71 |  | 71 |  |  |
Disposal Group, Disposed of by Sale | Unlimited Vacation Club |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percent prior to disposal |  |  |  |  | 0.80 |  |
Disposal group, consideration |  |  | $ 80 |  | $ 80 |  |
Ownership interest percentage after disposal |  |  |  |  | 20.00% |  |
Proceeds from divestiture of businesses |  |  |  |  | $ 41 |  |
Cash divested from deconsolidation |  |  |  |  | 39 |  |
Gains on sales of real estate |  |  |  |  | $ 231 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage |  |  |  |  |  | 50.00% |
Other long-term liabilities |  | 185 |  | 185 |  | $ 161 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Other long-term liabilities |  | $ 72 |  | $ 72 |  | $ 68 |

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