Subsequent Events Subsequent Events - Purchase Price Allocation (Details) - USD ($) $ in Millions		Jul. 16, 2020	Jul. 16, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill				$ 3,814	$ 3,815
Subsequent Event [Member]
Business Acquisition [Line Items]
Total purchase price			$ 1,700
Subsequent Event [Member] | Centaur Holdings, LLC [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			38
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables			3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			24
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			299
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			1,819
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			(96)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			(291)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(387)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			1,432
Goodwill			264
Total purchase price		$ 1,696
Trademarks [Member] | Subsequent Event [Member] | Centaur Holdings, LLC [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 14
Weighted Average Remaining Useful Life (in years)			2 years 6 months
Gaming rights | Subsequent Event [Member] | Centaur Holdings, LLC [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	[1]		$ 1,400
Customer relationships | Subsequent Event [Member] | Centaur Holdings, LLC [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 41
Weighted Average Remaining Useful Life (in years)			15 years

[1] (1) Indefinite-lived intangible assets.