v3.5.0.2
Document and Entity Information
9 Months Ended
Sep. 30, 2016
shares
Document Type 10-Q
Amendment Flag false
Document Period End Date Sep. 30, 2016
Document Fiscal Year Focus 2016
Document Fiscal Period Focus Q3
Trading Symbol cmcsa
Entity Registrant Name COMCAST CORP
Entity Central Index Key 0001166691
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
NBCUniversal Media LLC [Member]  
Entity Registrant Name NBCUniversal Media, LLC
Entity Central Index Key 0000902739
Entity Filer Category Non-accelerated Filer
Class A Common Stock [Member]  
Entity Common Stock, Shares Outstanding 2,383,388,019
Class B Common Stock [Member]  
Entity Common Stock, Shares Outstanding 9,444,375