Dispositions (Schedule of Dispositions, Net Earnings) (Details) - Discontinued Operations [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations [Line Items]
Revenues	$ 901	$ 814	$ 825
Costs and expenses:
Operating	554	460	476
Selling, general and administrative	172	166	158
Depreciation and amortization	5	5	6
Restructuring charges	10	6	1
Total costs and expenses	741	637	641
Operating income	160	177	184
Other items, net	(5)	(5)	(2)
Earnings from discontinued operations	155	172	182
Income tax provision	(38)	(32)	(47)
Net earnings from discontinued operations, net of tax	117	140	135
Simon & Schuster [Member]
Discontinued Operations [Line Items]
Revenues	901	814	825
Costs and expenses:
Operating	573	510	518
Selling, general and administrative	172	166	158
Depreciation and amortization	5	5	6
Restructuring charges	10	6	1
Total costs and expenses	760	687	683
Operating income	141	127	142
Other items, net	(5)	(5)	(2)
Earnings from discontinued operations	136	122	140
Income tax provision	(34)	(20)	(37)
Net earnings from discontinued operations, net of tax	102	102	103
Other [Member]
Discontinued Operations [Line Items]
Revenues	0	0	0
Costs and expenses:
Operating	(19)	(50)	(42)
Selling, general and administrative	0	0	0
Depreciation and amortization	0	0	0
Restructuring charges	0	0	0
Total costs and expenses	(19)	(50)	(42)
Operating income	19	50	42
Other items, net	0	0	0
Earnings from discontinued operations	19	50	42
Income tax provision	(4)	(12)	(10)
Net earnings from discontinued operations, net of tax	$ 15	$ 38	$ 32