Acquisitions and Purchase Price Accounting - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2021	Aug. 26, 2021	Apr. 22, 2021	Dec. 31, 2020	Jul. 20, 2020
Business Acquisition [Line Items]
Goodwill	$ 10,967			$ 9,864
Customer Relationships
Business Acquisition [Line Items]
Intangible asset	9
Gaming rights and other
Business Acquisition [Line Items]
Intangible asset	232
Caesars Entertainment Corp.
Business Acquisition [Line Items]
Current and other assets					$ 3,540
Property and equipment					13,096
Goodwill					9,064
Intangible assets (a)					3,394
Other noncurrent assets					710
Total assets					29,804
Current liabilities					1,771
Financing obligation					8,149
Long-term debt					6,591
Noncurrent liabilities					2,400
Total liabilities					18,911
Noncontrolling interests					18
Net assets acquired					10,875
Caesars Entertainment Corp. | Gaming Licenses
Business Acquisition [Line Items]
Intangible asset					396
Caesars Entertainment Corp. | Trade Names
Business Acquisition [Line Items]
Intangible asset					2,100
Caesars Entertainment Corp. | Caesars Rewards
Business Acquisition [Line Items]
Intangible asset					523
Caesars Entertainment Corp. | Customer Relationships
Business Acquisition [Line Items]
Intangible asset					$ 425
William Hill
Business Acquisition [Line Items]
Other current assets			$ 160
Assets held for sale			4,375
Property and equipment			55
Goodwill			1,102
Intangible assets (a)			565
Other noncurrent assets			307
Total assets			6,564
Current liabilities			249
Liabilities related to assets held for sale			2,130
Deferred income taxes			228
Noncurrent liabilities			35
Total liabilities			2,642
Noncontrolling interests			10
Net assets acquired			3,912
Intangible asset	$ 1,100
William Hill | Trade Names
Business Acquisition [Line Items]
Intangible asset			27
William Hill | Operating Agreements
Business Acquisition [Line Items]
Intangible asset			80
William Hill | Technology
Business Acquisition [Line Items]
Intangible asset			110
William Hill | Rights Value
Business Acquisition [Line Items]
Intangible asset			280
William Hill | User Relationship
Business Acquisition [Line Items]
Intangible asset			$ 68
Horseshoe Baltimore
Business Acquisition [Line Items]
Current assets		$ 60
Property and equipment		215
Intangible assets (a)		241
Other noncurrent assets		136
Total assets		652
Current liabilities		26
Long-term debt		272
Other long-term liabilities		158
Total liabilities		456
Noncontrolling interests		42
Net assets acquired		$ 154