Segment Information - Intersegment Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 116,385	$ 103,564	$ 108,942
Total Intersegment Revenue And Corporate And Other
Segment Reporting Information [Line Items]
Revenue	6,055	4,546	4,235
Total intersegment revenue | Cable Communications
Segment Reporting Information [Line Items]
Revenue	244	202	162
Total intersegment revenue | Media
Segment Reporting Information [Line Items]
Revenue	2,330	1,965	2,202
Total intersegment revenue | Studios
Segment Reporting Information [Line Items]
Revenue	3,186	2,214	1,727
Total intersegment revenue | Theme Parks
Segment Reporting Information [Line Items]
Revenue	2	0	0
Total intersegment revenue | Sky
Segment Reporting Information [Line Items]
Revenue	32	17	21
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	193	117	121
Corporate and Other | NBCUniversal
Segment Reporting Information [Line Items]
Revenue	$ 68	$ 31	$ 1