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ACQUISITIONS AND DISPOSITIONS - Starwood Consideration Transferred (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 23, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Cash consideration to Starwood shareholders, net of cash acquired of $1,116   $ 0 $ 2,412 $ 137
Starwood Hotels & Resorts        
Business Acquisition [Line Items]        
Equivalent shares of Marriott common stock issued in exchange for Starwood outstanding shares (in shares) 134.4      
Marriott common stock price as of Merger Date (in USD per share) $ 68.44      
Fair value of Marriott common stock issued in exchange for Starwood outstanding shares $ 9,198      
Cash consideration to Starwood shareholders, net of cash acquired of $1,116 2,412      
Fair value of Marriott equity-based awards issued in exchange for vested Starwood equity-based awards 71      
Total consideration transferred, net of cash acquired 11,681      
Cash acquired $ 1,116