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 |