Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Balance, beginning of period	$ 70,669	$ 68,725
Segment change	0
Acquisitions	979	149
Foreign currency translation and other	(1,459)	1,795
Balance, end of period	70,189	70,669
Operating Segments | Cable Communications
Goodwill [Roll Forward]
Balance, beginning of period	15,264	15,074
Segment change	0
Acquisitions	950	122
Foreign currency translation and other	(22)	68
Balance, end of period	16,192	15,264
Operating Segments | Media
Goodwill [Roll Forward]
Balance, beginning of period	13,994	14,067
Segment change	(13,994)
Acquisitions	0	0
Foreign currency translation and other	0	(73)
Balance, end of period	0	13,994
Operating Segments | Broadcast Television
Goodwill [Roll Forward]
Balance, beginning of period	1,062	1,059
Segment change	(1,062)
Acquisitions	0	0
Foreign currency translation and other	0	3
Balance, end of period	0	1,062
Operating Segments | Filmed Entertainment
Goodwill [Roll Forward]
Balance, beginning of period	3,344	3,321
Segment change	(3,344)
Acquisitions	0	27
Foreign currency translation and other	0	(4)
Balance, end of period	0	3,344
Operating Segments | Media
Goodwill [Roll Forward]
Balance, beginning of period	0	0
Segment change	14,728
Acquisitions	6	0
Foreign currency translation and other	(34)	0
Balance, end of period	14,700	0
Operating Segments | Studios
Goodwill [Roll Forward]
Balance, beginning of period	0	0
Segment change	3,672
Acquisitions	3	0
Foreign currency translation and other	(3)	0
Balance, end of period	3,672	0
Operating Segments | Theme Parks
Goodwill [Roll Forward]
Balance, beginning of period	7,053	6,739
Segment change	0
Acquisitions	0	0
Foreign currency translation and other	(624)	314
Balance, end of period	6,429	7,053
Operating Segments | Sky
Goodwill [Roll Forward]
Balance, beginning of period	29,950	28,461
Segment change	0
Acquisitions	21	0
Foreign currency translation and other	(775)	1,489
Balance, end of period	29,196	29,950
Corporate and Other
Goodwill [Roll Forward]
Balance, beginning of period	2	4
Segment change	0
Acquisitions	0	0
Foreign currency translation and other	(2)	(2)
Balance, end of period	$ 0	$ 2