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Cover Page
Feb. 05, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 05, 2020
Entity Registrant Name COMCAST CORP
Entity Central Index Key 0001166691
Entity Incorporation, State or Country Code PA
Entity File Number 001-32871
Entity Tax Identification Number 27-0000798
Entity Address, Address Line One One Comcast Center
Entity Address, City or Town Philadelphia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19103-2838
City Area Code (215)
Local Phone Number 286-1700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
NBCUniversal Media LLC [Member]  
Document Information [Line Items]  
Entity Registrant Name NBCUniversal Media, LLC
Entity Central Index Key 0000902739
Entity Incorporation, State or Country Code DE
Entity File Number 001-36438
Entity Tax Identification Number 14-1682529
Entity Address, Address Line One 30 Rockefeller Plaza
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10112-0015
City Area Code (212)
Local Phone Number 664-4444
Entity Emerging Growth Company false
Class A Common Stock, $0.01 par value [Member]  
Document Information [Line Items]  
Title of 12(b) Security Class A Common Stock, $0.01 par value
Trading Symbol CMCSA
Security Exchange Name NASDAQ
2.0% Exchangeable Subordinated Debentures due 2029 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 2.0% Exchangeable Subordinated Debentures due 2029
Trading Symbol CCZ
Security Exchange Name NYSE
5.50% Notes due 2029 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 5.50% Notes due 2029
Trading Symbol CCGBP29
Security Exchange Name NYSE
9.455% Guaranteed Notes due 2022 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 9.455% Guaranteed Notes due 2022
Trading Symbol CMCSA/22
Security Exchange Name NYSE