Segment Information - Financial Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Data by Business Segment
Revenue	$ 116,385	$ 103,564	$ 108,942
Adjusted EBITDA	34,708	30,826	34,258
Depreciation and Amortization	13,804	13,100	12,953
Capital Expenditures	9,174	9,179	9,953
Cash Paid for Intangible Assets	2,883	2,455	2,475
Operating Segments | Cable Communications
Financial Data by Business Segment
Revenue	64,328	60,051	58,082
Adjusted EBITDA	28,097	25,270	23,266
Depreciation and Amortization	7,811	7,753	7,994
Capital Expenditures	6,930	6,605	6,909
Cash Paid for Intangible Assets	1,438	1,333	1,426
Operating Segments | NBCUniversal
Financial Data by Business Segment
Revenue	34,319	27,211	33,958
Adjusted EBITDA	5,675	5,355	8,711
Depreciation and Amortization	2,466	2,307	2,129
Capital Expenditures	1,086	1,491	2,072
Cash Paid for Intangible Assets	360	373	337
Operating Segments | Media
Financial Data by Business Segment
Revenue	22,780	18,936	19,947
Adjusted EBITDA	4,569	5,574	5,834
Depreciation and Amortization	1,030	993	924
Capital Expenditures	100	122	204
Cash Paid for Intangible Assets	163	176	101
Operating Segments | Studios
Financial Data by Business Segment
Revenue	9,449	8,134	9,352
Adjusted EBITDA	884	1,041	1,058
Depreciation and Amortization	53	67	49
Capital Expenditures	5	12	19
Cash Paid for Intangible Assets	11	5	10
Operating Segments | Theme Parks
Financial Data by Business Segment
Revenue	5,051	2,094	6,213
Adjusted EBITDA	1,267	(477)	2,498
Depreciation and Amortization	906	772	697
Capital Expenditures	614	1,171	1,605
Cash Paid for Intangible Assets	43	56	60
Operating Segments | Sky
Financial Data by Business Segment
Revenue	20,285	18,594	19,219
Adjusted EBITDA	2,359	1,954	3,099
Depreciation and Amortization	3,379	3,034	2,699
Capital Expenditures	948	959	768
Cash Paid for Intangible Assets	814	741	707
Eliminations
Financial Data by Business Segment
Revenue	(3,008)	(2,540)	(2,650)
Adjusted EBITDA	(65)	32	2
Depreciation and Amortization	0	0	0
Capital Expenditures	0	0	0
Cash Paid for Intangible Assets	0	0	0
Eliminations | NBCUniversal
Financial Data by Business Segment
Revenue	(3,048)	(2,006)	(1,585)
Adjusted EBITDA	(205)	(220)	11
Depreciation and Amortization	0	0	0
Capital Expenditures	0	0	0
Cash Paid for Intangible Assets	0	0	0
Corporate and Other
Financial Data by Business Segment
Revenue	461	248	333
Adjusted EBITDA	(1,358)	(1,785)	(820)
Depreciation and Amortization	147	6	131
Capital Expenditures	210	124	204
Cash Paid for Intangible Assets	272	8	5
Corporate and Other | NBCUniversal
Financial Data by Business Segment
Revenue	87	53	31
Adjusted EBITDA	(840)	(563)	(690)
Depreciation and Amortization	478	475	459
Capital Expenditures	366	186	244
Cash Paid for Intangible Assets	$ 143	$ 136	$ 166