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Acquisitions and Purchase Price Accounting - Final Purchase Price Allocation Narrative (Details) (Details) $ in Millions, £ in Billions				2 Months Ended	3 Months Ended		6 Months Ended
	Apr. 22, 2021 GBP (£) state	Apr. 22, 2021 USD ($) state	Jul. 20, 2020 USD ($)	Jun. 30, 2021 USD ($) state sportsbook	Jun. 30, 2021 USD ($) state sportsbook	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) state sportsbook	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Business combination, acquisition related costs						$ 13		$ 22
Number of states gaming facilities are located \| state				16	16		16
Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							7 years
Gaming rights and other
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							34 years
Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							15 years
Caesars Entertainment Corporation
Business Acquisition [Line Items]
Goodwill, period decrease							$ 5
Decrease in liability				$ 5	$ 5		5
Business combination, acquisition related costs					3		15
Revenue since transaction							3,200
Loss since transaction							469
Total purchase consideration			$ 10,875
William Hill
Business Acquisition [Line Items]
Business combination, acquisition related costs					$ 62		$ 67
Revenue since transaction				48
Loss since transaction				$ (107)
Total purchase consideration	£ 2.9	$ 3,966
Number of sportsbooks \| sportsbook				37	37		37
Number of states gaming facilities are located \| state	17	17		8	8		8
Number of states regulated online real money gaming business \| state	5	5
William Hill \| Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							15 years
William Hill \| Technology
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							6 years
William Hill \| User Relationship
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							3 years
William Hill \| Rights Value
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							24 years
William Hill \| Operating Agreements
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life							20 years