Condensed Consolidating Financial Statements (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Income Statements, Captions [Line Items]
Revenues	$ 3,809	$ 3,466	$ 7,976	$ 7,227
Costs and expenses:
Operating	2,509	2,184	5,257	4,584
Selling, general and administrative	545	532	1,118	1,056
Depreciation and amortization	53	56	106	112
Restructuring and other corporate matters	7	35	121	44
Gain on sale of assets	0	0	(549)	0
Total costs and expenses	3,114	2,807	6,053	5,796
Operating income (loss)	695	659	1,923	1,431
Interest (expense) income, net	(103)	(102)	(206)	(203)
Other items, net	(21)	(24)	(42)	(35)
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	571	533	1,675	1,193
Benefit (provision) for income taxes	(119)	(113)	377	(248)
Equity in earnings (loss) of investee companies, net of tax	(12)	(20)	(29)	(34)
Net earnings	440	400	2,023	911
Total comprehensive income	452	407	2,052	927
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	0	0	0	0
Costs and expenses:
Operating	0	0	0	0
Selling, general and administrative	0	0	0	0
Depreciation and amortization	0	0	0	0
Restructuring and other corporate matters	0	0	0	0
Gain on sale of assets			0
Total costs and expenses	0	0	0	0
Operating income (loss)	0	0	0	0
Interest (expense) income, net	0	0	0	0
Other items, net	0	0	0	0
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	0	0	0	0
Benefit (provision) for income taxes	0	0	0	0
Equity in earnings (loss) of investee companies, net of tax	(952)	(857)	(2,591)	(1,887)
Net earnings	(952)	(857)	(2,591)	(1,887)
Total comprehensive income	(952)	(846)	(2,585)	(1,872)
CBS Corp. [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	43	44	89	87
Costs and expenses:
Operating	24	23	50	48
Selling, general and administrative	12	12	26	25
Depreciation and amortization	1	1	2	2
Restructuring and other corporate matters	0	0	3	0
Gain on sale of assets			0
Total costs and expenses	37	36	81	75
Operating income (loss)	6	8	8	12
Interest (expense) income, net	(138)	(133)	(275)	(263)
Other items, net	(10)	(9)	(18)	(16)
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	(142)	(134)	(285)	(267)
Benefit (provision) for income taxes	32	28	61	55
Equity in earnings (loss) of investee companies, net of tax	550	506	2,247	1,123
Net earnings	440	400	2,023	911
Total comprehensive income	452	407	2,052	927
CBS Operations Inc. [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	2	2	5	5
Costs and expenses:
Operating	1	1	2	2
Selling, general and administrative	68	68	125	132
Depreciation and amortization	5	5	10	11
Restructuring and other corporate matters	7	16	30	25
Gain on sale of assets			0
Total costs and expenses	81	90	167	170
Operating income (loss)	(79)	(88)	(162)	(165)
Interest (expense) income, net	(137)	(126)	(268)	(248)
Other items, net	(9)	14	(20)	12
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	(225)	(200)	(450)	(401)
Benefit (provision) for income taxes	50	42	96	83
Equity in earnings (loss) of investee companies, net of tax	402	351	344	764
Net earnings	227	193	(10)	446
Total comprehensive income	232	202	(7)	448
Non-Guarantor Affiliates [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	3,764	3,420	7,882	7,135
Costs and expenses:
Operating	2,484	2,160	5,205	4,534
Selling, general and administrative	465	452	967	899
Depreciation and amortization	47	50	94	99
Restructuring and other corporate matters	0	19	88	19
Gain on sale of assets			(549)
Total costs and expenses	2,996	2,681	5,805	5,551
Operating income (loss)	768	739	2,077	1,584
Interest (expense) income, net	172	157	337	308
Other items, net	(2)	(29)	(4)	(31)
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	938	867	2,410	1,861
Benefit (provision) for income taxes	(201)	(183)	220	(386)
Equity in earnings (loss) of investee companies, net of tax	(12)	(20)	(29)	(34)
Net earnings	725	664	2,601	1,441
Total comprehensive income	$ 720	$ 644	$ 2,592	$ 1,424