Basis of Presentation and Principles of Consolidation Basis of Presentation and Principles of Consolidation - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	May 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Expenses		$ 1,953	$ 1,837	$ 3,828	$ 3,684
Restatement Adjustment [Member]
Operating Expenses			$ 5		$ 10
Emerald Resort & Casino, South Africa disposition [Member]
Proceeds from Divestiture of Businesses	$ 49
Noncontrolling Interest, Ownership Percentage by Parent		70.00%		70.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		30.00%		30.00%
Proceeds from Divestiture of Business, ownership interest	$ 39