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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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