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Related Party Transactions - Expenses Incurred and Payments Made to Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
American Entertainment Properties Corporation | Tax Allocation Agreement        
Related Party Transaction [Line Items]        
Payments made $ 8 $ 10 $ 8 $ 10