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Business and Basis of Presentation (Details)
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Dec. 31, 2014
numberofcustomers
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Mar. 19, 2013
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| Remaining equity interest acquired | 49.00%cmcsa_NoncontrollingInterestAcquired | |
| Total customer relationships | 27,000,000cmcsa_Totalcustomerrelationships | |
| NBCUniversal Media, LLC [Member] | ||
| Remaining equity interest acquired | 49.00%cmcsa_NoncontrollingInterestAcquired / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
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| Video Customers [Member] | ||
| Number of customers | 22,400,000cmcsa_NumberOfCustomers / us-gaap_StatementBusinessSegmentsAxis = cmcsa_VideoCustomersMember |
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| High-speed Internet Customers [Member] | ||
| Number of customers | 22,000,000cmcsa_NumberOfCustomers / us-gaap_StatementBusinessSegmentsAxis = cmcsa_HighSpeedInternetCustomersMember |
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| Voice Customers [Member] | ||
| Number of customers | 11,200,000cmcsa_NumberOfCustomers / us-gaap_StatementBusinessSegmentsAxis = cmcsa_PhoneCustomersMember |
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- Definition
Represents the percentage of voting interest acquired at the acquisition date from a noncontrolling interest. No definition available.
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Number of customers No definition available.
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Represents the number of residential and business customers that subscribe to at least one of our three primary services of video, high-speed Internet and voice. No definition available.
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