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Acquisitions, Disposals and Other Transactions (Narrative) (Details) $ in Millions, $ in Millions	1 Months Ended				3 Months Ended	6 Months Ended
	Nov. 30, 2019 USD ($) TelevisionStation	Oct. 31, 2019 USD ($)	Oct. 31, 2019 AUD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired						$ 260	$ 0
Goodwill						$ 2,991		$ 2,691
The Stars Group
Business Acquisition [Line Items]
Payments to acquire investments				$ 236
Percentage of ownership of equity interest				4.99%
Transfer restrictions period, month and year				2021-05
Caffeine and Caffeine Studios
Business Acquisition [Line Items]
Payments to acquire investments					$ 100
Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, Useful life						5 years
Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, Useful life						20 years
Maximum \| The Stars Group's U.S. business
Business Acquisition [Line Items]
Percentage of ownership interest that can be acquired in the future				50.00%
Pending Transaction Not Yet Completed \| FanDuel Group
Business Acquisition [Line Items]
Percentage of ownership interest that can be acquired in the future		18.50%
Option term to acquire an equity interest		10 years	10 years
Nexstar \| Pending Transaction Not Yet Completed
Business Acquisition [Line Items]
Number of television stations acquired \| TelevisionStation	3
Business acquisition, purchase price	$ 350
Number of television stations agreed to sell \| TelevisionStation	2
Disposition, sale price	$ 45
Credible
Business Acquisition [Line Items]
Business acquisition, purchase price		$ 260
Business acquisition, percentage of equity acquired		67.00%
Payments to acquire businesses, net of cash acquired		$ 260	$ 390
Business combination valuation percentage		100.00%	100.00%
Business Combination, Recognized Identifiable Assets Acquired finite-lived intangibles		$ 70
Goodwill		285
Business Combination, Redeemable noncontrolling interests		(110)
Maximum capital to be contributed		$ 75
Period over which capital will be contributed		2 years	2 years
Credible \| Credible
Business Acquisition [Line Items]
Remaining percentage of equity not acquired by parent		33.00%
Credible \| Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, Useful life		5 years	5 years
Credible \| Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, Useful life		10 years	10 years