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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Sep. 30, 2016
Dec. 31, 2014
Discontinued Operations, Disposed of by Sale [Member] | Social and Mobile Games [Member]            
Line Items            
Gain from discontinued operations   $ 4,180 $ 0      
Discontinued Operations, Disposed of by Sale [Member] | Caesars Interactive Entertainment [Member] | Social and Mobile Games [Member]            
Line Items            
Disposal Group, Including Discontinued Operation, Consideration         $ 4,400  
Gain from discontinued operations   4,200        
Payments of Distributions to Affiliates $ 63 1,100        
Discontinued Operations, Disposed of by Sale [Member] | Caesars Acquisition Company [Member] | Social and Mobile Games [Member]            
Line Items            
Escrow Deposit   259        
Discontinued Operations, Disposed of by Sale [Member] | Caesars Entertainment Operating Company [Member] | Showboat Atlantic City [Member]            
Line Items            
Disposal Group, Including Discontinued Operation, Consideration           $ 18
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Caesars Entertainment Operating Company [Member] | Horseshoe Council Bluffs [Member]            
Line Items            
Discontinued Operation, Other Liabilities   $ 65   $ 40    
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Caesars Entertainment Operating Company [Member] | Harrah's Gulf Coast construction project [Member]            
Line Items            
Discontinued Operation, Other Liabilities       43    
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Caesars Entertainment Operating Company [Member] | Disposal Group Other [Member]            
Line Items            
Discontinued Operation, Other Liabilities       $ 18