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Related Party Transactions - Amounts Due from Related Parties (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Amounts due from related parties $ 0 $ 4
Tax Allocation Agreement | American Entertainment Properties Corporation (“AEP”)    
Related Party Transaction [Line Items]    
Amounts due from related parties $ 0 $ 4