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DEBT AND EQUITY SECURITIES - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total $ 1,732 $ 2,409
HTM debt securities 315 276
Preferred Equity Investment | Hyatt Regency Orlando    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
HTM debt securities 194 194
Level One—Quoted Prices in Active Markets for Identical Assets | Interest-bearing money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 308 638
Level One—Quoted Prices in Active Markets for Identical Assets | Mutual funds and exchange-traded funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 596 555
Level One—Quoted Prices in Active Markets for Identical Assets | Ordinary and common shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 12 164
Level Two—Significant Other Observable Inputs | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 133 404
Level Two—Significant Other Observable Inputs | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 287 307
Level Two—Significant Other Observable Inputs | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 31 21
Level Two—Significant Other Observable Inputs | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 289 249
Level Two—Significant Other Observable Inputs | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 36 29
Level Two—Significant Other Observable Inputs | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 36 38
Level Two—Significant Other Observable Inputs | Municipal and provincial notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 4 4
Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 325 658
Cash and cash equivalents | Level One—Quoted Prices in Active Markets for Identical Assets | Interest-bearing money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 308 638
Cash and cash equivalents | Level One—Quoted Prices in Active Markets for Identical Assets | Mutual funds and exchange-traded funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Cash and cash equivalents | Level One—Quoted Prices in Active Markets for Identical Assets | Ordinary and common shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 17 20
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Cash and cash equivalents | Level Two—Significant Other Observable Inputs | Municipal and provincial notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 52 372
Short-term investments | Level One—Quoted Prices in Active Markets for Identical Assets | Interest-bearing money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Short-term investments | Level One—Quoted Prices in Active Markets for Identical Assets | Mutual funds and exchange-traded funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Short-term investments | Level One—Quoted Prices in Active Markets for Identical Assets | Ordinary and common shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Short-term investments | Level Two—Significant Other Observable Inputs | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 20 355
Short-term investments | Level Two—Significant Other Observable Inputs | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 6 5
Short-term investments | Level Two—Significant Other Observable Inputs | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Short-term investments | Level Two—Significant Other Observable Inputs | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 26 12
Short-term investments | Level Two—Significant Other Observable Inputs | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Short-term investments | Level Two—Significant Other Observable Inputs | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Short-term investments | Level Two—Significant Other Observable Inputs | Municipal and provincial notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 0 0
Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 1,355 1,379
Other assets | Level One—Quoted Prices in Active Markets for Identical Assets | Interest-bearing money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Other assets | Level One—Quoted Prices in Active Markets for Identical Assets | Mutual funds and exchange-traded funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 596 555
Other assets | Level One—Quoted Prices in Active Markets for Identical Assets | Ordinary and common shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 12 164
Other assets | Level Two—Significant Other Observable Inputs | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 96 29
Other assets | Level Two—Significant Other Observable Inputs | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 281 302
Other assets | Level Two—Significant Other Observable Inputs | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 31 21
Other assets | Level Two—Significant Other Observable Inputs | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 263 237
Other assets | Level Two—Significant Other Observable Inputs | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 36 29
Other assets | Level Two—Significant Other Observable Inputs | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale 36 38
Other assets | Level Two—Significant Other Observable Inputs | Municipal and provincial notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, available-for-sale $ 4 $ 4