Discontinued Operations (Net Earnings (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Costs and expenses:
Income tax benefit (provision)	$ (12)	$ (10)	$ (10)
Net earnings (loss) from discontinued operations, net of tax	$ 38	$ 32	(947)
Discontinued Operations [Member]
Discontinued Operations [Line Items]
Revenues			1,018
Costs and expenses:
Operating			364
Selling, general and administrative			436
Market value adjustment			980
Restructuring charges			7
Total costs and expenses			1,787
Operating loss			(769)
Interest expense			(70)
Other items, net			(2)
Earnings (loss) from discontinued operations			(841)
Income tax benefit (provision)			(12)
Earnings (loss) from discontinued operations, net of tax			(853)
Net gain (loss) on disposal			(96)
Income tax benefit (provision)			2
Net gain (loss) on disposal, net of tax			(94)
Net earnings (loss) from discontinued operations, net of tax			(947)
Discontinued Operations [Member] | CBS Radio [Member]
Discontinued Operations [Line Items]
Revenues			1,018
Costs and expenses:
Operating			364
Selling, general and administrative			444
Market value adjustment			980
Restructuring charges			7
Total costs and expenses			1,795
Operating loss			(777)
Interest expense			(70)
Other items, net			(2)
Earnings (loss) from discontinued operations			(849)
Income tax benefit (provision)			(55)
Earnings (loss) from discontinued operations, net of tax			(904)
Net gain (loss) on disposal			(109)
Income tax benefit (provision)			4
Net gain (loss) on disposal, net of tax			(105)
Net earnings (loss) from discontinued operations, net of tax			(1,009)
Discontinued Operations [Member] | Other [Member]
Discontinued Operations [Line Items]
Revenues			0
Costs and expenses:
Operating			0
Selling, general and administrative			(8)
Market value adjustment			0
Restructuring charges			0
Total costs and expenses			(8)
Operating loss			8
Interest expense			0
Other items, net			0
Earnings (loss) from discontinued operations			8
Income tax benefit (provision)			43
Earnings (loss) from discontinued operations, net of tax			51
Net gain (loss) on disposal			13
Income tax benefit (provision)			(2)
Net gain (loss) on disposal, net of tax			11
Net earnings (loss) from discontinued operations, net of tax			$ 62