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Acquisitions and Dispositions- Starwood Consideration Transferred (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Sep. 23, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Cash consideration to Starwood shareholders, net of cash acquired of $1,116   $ 0 $ 2,412
Starwood Hotels & Resorts Worldwide, Inc.      
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