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Document and Entity Information
May 05, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name COMCAST CORP
Amendment Flag false
Entity Central Index Key 0001166691
Document Type 8-K
Document Period End Date May 05, 2025
Entity Incorporation State 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
Common Class A [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A Common Stock, $0.01 par value
Trading Symbol CMCSA
Security Exchange Name NASDAQ
Notes 0000 Percent Due 2026 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.000% Notes due 2026
Trading Symbol CMCS26
Security Exchange Name NASDAQ
Notes 0.250percent Due 2027 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.250% Notes due 2027
Trading Symbol CMCS27
Security Exchange Name NASDAQ
Notes 1.500percent Due 2029 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.500% Notes due 2029
Trading Symbol CMCS29
Security Exchange Name NASDAQ
M 0.250 Notes Due 20292 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.250% Notes due 2029
Trading Symbol CMCS29A
Security Exchange Name NASDAQ
Notes 0.750 Percent Due 2032 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.750% Notes due 2032
Trading Symbol CMCS32
Security Exchange Name NASDAQ
Notes 3.250 Percent Due 2032 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.250% Notes due 2032
Trading Symbol CMCS32A
Security Exchange Name NASDAQ
Notes 1.875percentdue 2036 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.875% Notes due 2036
Trading Symbol CMCS36
Security Exchange Name NASDAQ
Notes 3.550 Percent Due 2036 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.550% Notes due 2036
Trading Symbol CMCS36A
Security Exchange Name NASDAQ
Notes 1.250percentdue 2040 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.250% Notes due 2040
Trading Symbol CMCS40
Security Exchange Name NASDAQ
Notes 5.250 Percent Due 2040 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 5.250% Notes due 2040
Trading Symbol CMCS40A
Security Exchange Name NASDAQ
M 5.50 Notes Due 20291 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 5.50% Notes due 2029
Trading Symbol CCGBP29
Security Exchange Name NYSE
Exchangeable Subordinated Debentures 2.0 Percent Due 2029 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.0% Exchangeable Subordinated Debentures due 2029
Trading Symbol CCZ
Security Exchange Name NYSE