Commitments and Contingencies (Details) $ in Millions		1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018 USD ($)	Mar. 31, 2020 USD ($) claim	Mar. 31, 2019	Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($)	Jan. 23, 2020 claim
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit and surety bonds			$ 138
Loss Contingencies [Line Items]
Number of consolidated class action lawsuits | claim							4
Contributions to grantor trust		$ 120
Costs for settlement and defense of asbestos claims, net of insurance recoveries and taxes					$ 58	$ 45
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Number of pending asbestos claims | claim			31,080		30,950
Number of new asbestos claims | claim			730
Number of asbestos claims closed or moved to inactive docket | claim			600
CBS Television City [Member]
Loss Contingencies [Line Items]
Guaranteed cash flow period	5 years			5 years
Estimated liability			$ 98
Famous Players [Member]
Loss Contingencies [Line Items]
Estimated liability			$ 75