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Condensed Consolidating Financial Information (Narrative) (Details) (USD $)
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Jun. 30, 2014
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|---|---|
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Comcast Holdings' ZONES due October 2029 [Member]
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|
| Principal amount of debt securities subject to guarantee | $ 185,000,000 |
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Comcast Holdings' ZONES due November 2029 [Member]
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|
| Principal amount of debt securities not subject to guarantee | 62,000,000 |
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NBCUniversal Enterprise Credit Facility
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|
| Credit facility borrowing capacity | 1,350,000,000 |
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NBCUniversal Enterprise [Member]
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| Principal amount of debt securities subject to guarantee | $ 4,000,000,000 |