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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenue $ 28,398 $ 26,827 $ 26,858 $ 26,859 $ 27,846 $ 22,135 $ 21,735 $ 22,791 $ 108,942 $ 94,507 $ 85,029
Cable Communications [Member] | Franchise And Other Regulatory Fees [Member]                      
Disaggregation of Revenue [Line Items]                      
Cable segment revenue types as percentage of total cable revenue                 2.60% 2.60% 2.80%
NBCUniversal Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 33,967 $ 35,761 $ 32,836
Operating Segments [Member] | Cable Communications [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 58,082 56,033 53,399
Operating Segments [Member] | Cable Communications [Member] | Residential, High-Speed Internet [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 18,752 17,144 15,681
Operating Segments [Member] | Cable Communications [Member] | Residential, Video [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 22,270 22,455 22,874
Operating Segments [Member] | Cable Communications [Member] | Residential, Voice [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 3,879 3,960 4,090
Operating Segments [Member] | Cable Communications [Member] | Residential, Wireless [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,167 890 329
Operating Segments [Member] | Cable Communications [Member] | Business Services [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 7,795 7,129 6,437
Operating Segments [Member] | Cable Communications [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,465 2,795 2,450
Operating Segments [Member] | Cable Communications [Member] | Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,754 1,660 1,538
Operating Segments [Member] | Cable Networks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 11,513 11,773 10,497
Operating Segments [Member] | Cable Networks [Member] | Distribution [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,790 6,826 6,081
Operating Segments [Member] | Cable Networks [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 3,478 3,587 3,359
Operating Segments [Member] | Cable Networks [Member] | Content Licensing And Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,245 1,360 1,057
Operating Segments [Member] | Broadcast Television [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 10,261 11,439 9,563
Operating Segments [Member] | Broadcast Television [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5,712 7,010 5,654
Operating Segments [Member] | Filmed Entertainment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,493 7,152 7,595
Operating Segments [Member] | Filmed Entertainment [Member] | Theatrical [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,469 2,111 2,192
Operating Segments [Member] | Filmed Entertainment [Member] | Content Licensing [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 3,045 2,899 2,956
Operating Segments [Member] | Filmed Entertainment [Member] | Home Entertainment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 957 1,048 1,287
Operating Segments [Member] | Filmed Entertainment [Member] | Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,022 1,094 1,160
Operating Segments [Member] | Theme Parks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5,933 5,683 5,443
Operating Segments [Member] | NBCUniversal Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 33,967 35,761 32,836
Operating Segments [Member] | Sky Limited [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 19,219 4,587 0
Operating Segments [Member] | Sky Limited [Member] | Direct To Consumer [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 15,538 3,632 0
Operating Segments [Member] | Sky Limited [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,249 651 0
Operating Segments [Member] | Sky Limited [Member] | Content [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,432 304 0
Corporate, Non-Segment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 333 513 864
Corporate, Non-Segment [Member] | NBCUniversal Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 83 63 45
Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (2,659) (2,387) (2,070)
Eliminations [Member] | NBCUniversal Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 (316) (349) (307)
NBCUniversal Media LLC [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 34,021 35,895 32,950
NBCUniversal Media LLC [Member] | Cable Networks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 11,513 11,773 10,497
NBCUniversal Media LLC [Member] | Cable Networks [Member] | Distribution [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,790 6,826 6,081
NBCUniversal Media LLC [Member] | Cable Networks [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 3,478 3,587 3,359
NBCUniversal Media LLC [Member] | Cable Networks [Member] | Content Licensing And Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,245 1,360 1,057
NBCUniversal Media LLC [Member] | Broadcast Television [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 10,261 11,439 9,563
NBCUniversal Media LLC [Member] | Broadcast Television [Member] | Advertising [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5,712 7,010 5,654
NBCUniversal Media LLC [Member] | Filmed Entertainment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,493 7,152 7,595
NBCUniversal Media LLC [Member] | Filmed Entertainment [Member] | Theatrical [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,469 2,111 2,192
NBCUniversal Media LLC [Member] | Filmed Entertainment [Member] | Content Licensing [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 3,045 2,899 2,956
NBCUniversal Media LLC [Member] | Filmed Entertainment [Member] | Home Entertainment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 957 1,048 1,287
NBCUniversal Media LLC [Member] | Filmed Entertainment [Member] | Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,022 1,094 1,160
NBCUniversal Media LLC [Member] | Theme Parks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5,933 5,683 5,443
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Cable Networks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 11,513 11,773 10,497
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Broadcast Television [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 10,261 11,439 9,563
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Broadcast Television [Member] | Content Licensing [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,157 2,182 2,114
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Broadcast Television [Member] | Distribution And Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,392 2,247 1,795
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Filmed Entertainment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 6,493 7,152 7,595
NBCUniversal Media LLC [Member] | Operating Segments [Member] | Theme Parks [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5,933 5,683 5,443
NBCUniversal Media LLC [Member] | Corporate, Non-Segment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 142 212 179
NBCUniversal Media LLC [Member] | Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ (321) $ (364) $ (327)