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FAIR VALUE MEASUREMENTS - Investments Measured at Fair Value (Details) - EBP 004 - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | $ 12,598,187,281 | $ 11,550,738,669
Total |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 5,896,350,178 | 5,833,205,320
Total | Cash and cash equivalents |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 14,509,693 | 18,472,459
Total | Corporate bonds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 593,950,900 | 578,350,781
Total | Preferred stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 6,697,998 | 6,495,180
Total | Common stock - Marriott International, Inc. |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,953,929,059 | 1,983,658,937
Total | Common stock - others |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 2,425,348,263 | 2,424,723,827
Total | Foreign government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,967,625 | 2,662,816
Total | U.S. government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 519,432,904 | 520,647,825
Total | Mutual and registered investment funds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 380,513,736 | 298,193,495
Level 1 |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 4,779,768,878 | 4,730,530,125
Level 1 | Cash and cash equivalents |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 14,509,693 | 18,472,459
Level 1 | Corporate bonds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Preferred stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 5,629,831 | 5,588,806
Level 1 | Common stock - Marriott International, Inc. |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,953,929,059 | 1,983,658,937
Level 1 | Common stock - others |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 2,425,186,559 | 2,424,616,428
Level 1 | Foreign government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | U.S. government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Mutual and registered investment funds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 380,513,736 | 298,193,495
Level 2 |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,116,581,300 | 1,102,675,195
Level 2 | Cash and cash equivalents |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 2 | Corporate bonds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 593,950,900 | 578,350,781
Level 2 | Preferred stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,068,167 | 906,374
Level 2 | Common stock - Marriott International, Inc. |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 2 | Common stock - others |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 161,704 | 107,399
Level 2 | Foreign government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 1,967,625 | 2,662,816
Level 2 | U.S. government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 519,432,904 | 520,647,825
Level 2 | Mutual and registered investment funds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Cash and cash equivalents |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Corporate bonds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Preferred stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Common stock - Marriott International, Inc. |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Common stock - others |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Foreign government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | U.S. government debt securities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Mutual and registered investment funds |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | 0 | 0
Fair Value Measured at Net Asset Value Per Share |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Investments, at fair value | $ 6,701,837,103 | $ 5,717,533,349

X
- Definition Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). 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