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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 31 $ 30 $ 59 $ 55  
Deferred compensation costs related to unvested awards $ 213   $ 213   $ 116
Remaining shares authorized 23.0   23.0    
RSUs and Performance-based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, weighted average grant-date fair value (in USD per share)     $ 63    
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     1.6    
Stock awards, vesting period     4 years    
Stock awards, percentage of award vesting and becoming exercisable annually     25.00%    
Stock awards, period of service after grant date     1 year    
Stock Appreciation Rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     0.4    
Stock awards, vesting period     4 years    
Stock awards, percentage of award vesting and becoming exercisable annually     25.00%    
Stock awards, expiration     10 years    
Stock awards, weighted average grant-date fair value (in USD per share)     $ 24    
Stock awards, weighted average exercise price (in USD per share)     $ 67    
Executive Officers | Performance-based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     0.2    
Stock awards, vesting period     3 years    
Senior Leaders and Members of Starwood Integration Team | Performance-based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     0.6    
Stock awards, vesting period     3 years