v3.26.1
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