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Cover
Jan. 06, 2023
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 06, 2023
Entity File Number 001-32871
Entity Registrant Name Comcast Corporation
Entity Central Index Key 0001166691
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Class A Common Stock, $0.01 par value  
Title of 12(b) Security Class A Common Stock, $0.01 par value
Trading Symbol CMCSA
Security Exchange Name NASDAQ
Sec 0. 000 Percent Notes Due 2026 [Member]  
Title of 12(b) Security 0.000% Notes due 2026
0.000% Notes due 2026  
Trading Symbol CMCS26
Security Exchange Name NASDAQ
Sec 0. 250 Percent Notes Due 2027 [Member]  
Title of 12(b) Security 0.250% Notes due 2027
0.250% Notes due 2027  
Trading Symbol CMCS27
Security Exchange Name NASDAQ
Sec 1. 500 Percent Notes Due 2029 [Member]  
Title of 12(b) Security 1.500% Notes due 2029
1.500% Notes due 2029  
Trading Symbol CMCS29
Security Exchange Name NASDAQ
Sec 0. 250 Percent Notes Due 2029 [Member]  
Title of 12(b) Security 0.250% Notes due 2029
0.250% Notes due 2029  
Trading Symbol CMCS29A
Security Exchange Name NASDAQ
Sec 0. 750 Percent Notes Due 2032 [Member]  
Title of 12(b) Security 0.750% Notes due 2032
0.750% Notes due 2032  
Trading Symbol CMCS32
Security Exchange Name NASDAQ
Sec 1. 875 Percent Notes Due 2036 [Member]  
Title of 12(b) Security 1.875% Notes due 2036
1.875% Notes due 2036  
Trading Symbol CMCS36
Security Exchange Name NASDAQ
Sec 1. 250 Percent Notes Due 2040 [Member]  
Title of 12(b) Security 1.250% Notes due 2040
1.250% Notes due 2040  
Trading Symbol CMCS40
Security Exchange Name NASDAQ
Sec 5. 50 Percent Notes Due 2029 [Member]  
Title of 12(b) Security 5.50% Notes due 2029
5.50% Notes due 2029  
Trading Symbol CCGBP29
Security Exchange Name NYSE
Sec 2. 0 Percent Exchangeable Subordinated Debentures Due 2029 [Member]  
Title of 12(b) Security 2.0% Exchangeable Subordinated Debentures due 2029
2.0% Exchangeable Subordinated Debentures due 2029  
Trading Symbol CCZ
Security Exchange Name NYSE