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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Document And Entity Information [Line Items]    
Document Type 10-K  
Document Fiscal Period Focus FY  
Document Annual Report true  
Document Period End Date Dec. 31, 2019  
Document Transition Report false  
Amendment Flag false  
Document Fiscal Year Focus 2019  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001166691  
Entity File Number 001-32871  
Entity Registrant Name COMCAST CORPORATION  
Entity Tax Identification Number 27-0000798  
Entity Incorporation, State or Country Code PA  
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  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Public Float   $ 190,526
Documents Incorporated by Reference
Comcast Corporation – Part III – The registrant’s definitive Proxy Statement for its annual meeting of shareholders presently scheduled to be held in June 2020.
NBCUniversal Media, LLC – NONE
 

  
NBCUniversal Media LLC [Member]    
Document And Entity Information [Line Items]    
Entity Central Index Key 0000902739  
Entity File Number 001-36438  
Entity Registrant Name NBCUNIVERSAL MEDIA, LLC  
Entity Tax Identification Number 14-1682529  
Entity Incorporation, State or Country Code DE  
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 Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Class A Common Stock [Member]    
Document And Entity Information [Line Items]    
Title of 12(b) Security Class A Common Stock, $0.01 par value  
Trading Symbol CMCSA  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding 4,543,590,270  
2.0% Exchangeable Subordinated Debentures due 2029 [Member]    
Document And Entity 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 And Entity 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 And Entity Information [Line Items]    
Title of 12(b) Security 9.455% Guaranteed Notes due 2022  
Trading Symbol CMCSA/22  
Security Exchange Name NYSE  
Class B Common Stock [Member]    
Document And Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding 9,444,375