Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Goodwill, beginning balance	$ 29,880	$ 29,905
Accumulated impairment losses, beginning balance	(13,354)	(13,354)
Goodwill, net of impairment, beginning balance	16,526	16,551
Acquisitions/(Dispositions)	448	91
Accumulated impairment losses, Acquisitions	0	0
Goodwill, net of impairment, Acquisitions	448	91
Currency	6	(116)
Accumulated impairment losses, Dispositions	0	0
Goodwill, net of impairment, Dispositions	6	(116)
Goodwill, ending balance	30,334	29,880
Accumulated impairment losses, ending balance	(13,354)	(13,354)
Goodwill, net of impairment, ending balance	16,980	16,526
Operating Segments [Member] | TV Entertainment [Member]
Goodwill
Goodwill, beginning balance	17,618	17,591
Accumulated impairment losses, beginning balance	(13,354)	(13,354)
Goodwill, net of impairment, beginning balance	4,264	4,237
Acquisitions/(Dispositions)	(3)	27
Accumulated impairment losses, Acquisitions	0	0
Goodwill, net of impairment, Acquisitions	(3)	27
Currency	0	0
Accumulated impairment losses, Dispositions	0	0
Goodwill, net of impairment, Dispositions	0	0
Goodwill, ending balance	17,615	17,618
Accumulated impairment losses, ending balance	(13,354)	(13,354)
Goodwill, net of impairment, ending balance	4,261	4,264
Operating Segments [Member] | Cable Networks [Member]
Goodwill
Goodwill, beginning balance	10,234	10,286
Accumulated impairment losses, beginning balance	0	0
Goodwill, net of impairment, beginning balance	10,234	10,286
Acquisitions/(Dispositions)	451	64
Accumulated impairment losses, Acquisitions	0	0
Goodwill, net of impairment, Acquisitions	451	64
Currency	6	(116)
Accumulated impairment losses, Dispositions	0	0
Goodwill, net of impairment, Dispositions	6	(116)
Goodwill, ending balance	10,691	10,234
Accumulated impairment losses, ending balance	0	0
Goodwill, net of impairment, ending balance	10,691	10,234
Operating Segments [Member] | Filmed Entertainment [Member]
Goodwill
Goodwill, beginning balance	1,593	1,593
Accumulated impairment losses, beginning balance	0	0
Goodwill, net of impairment, beginning balance	1,593	1,593
Acquisitions/(Dispositions)	0	0
Accumulated impairment losses, Acquisitions	0	0
Goodwill, net of impairment, Acquisitions	0	0
Currency	0	0
Accumulated impairment losses, Dispositions	0	0
Goodwill, net of impairment, Dispositions	0	0
Goodwill, ending balance	1,593	1,593
Accumulated impairment losses, ending balance	0	0
Goodwill, net of impairment, ending balance	1,593	1,593
Operating Segments [Member] | Publishing [Member]
Goodwill
Goodwill, beginning balance	435	435
Accumulated impairment losses, beginning balance	0	0
Goodwill, net of impairment, beginning balance	435	435
Acquisitions/(Dispositions)	0
Accumulated impairment losses, Acquisitions	0	0
Goodwill, net of impairment, Acquisitions	0	0
Currency	0	0
Accumulated impairment losses, Dispositions	0	0
Goodwill, net of impairment, Dispositions	0	0
Goodwill, ending balance	435	435
Accumulated impairment losses, ending balance	0	0
Goodwill, net of impairment, ending balance	$ 435	$ 435