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Property and Equipment (Details) (USD $)
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12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
NBCUniversal Media, LLC [Member]
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Dec. 31, 2012
NBCUniversal Media, LLC [Member]
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Dec. 31, 2013
Cable Distribution System [Member]
numberofyears
|
Dec. 31, 2013
Customer Premise Equipment [Member]
numberofyears
|
Dec. 31, 2013
Other Equipment [Member]
numberofyears
|
Dec. 31, 2013
Buildings and Leasehold Improvements [Member]
numberofyears
|
Dec. 31, 2013
Buildings and Leasehold Improvements [Member]
NBCUniversal Media, LLC [Member]
numberofyears
|
Dec. 31, 2013
Furniture Fixtures And Equipment [Member]
NBCUniversal Media, LLC [Member]
numberofyears
|
Dec. 31, 2013
Comcast Center [Member]
|
Dec. 31, 2013
Acquisition Of Real Estate Properties [Member]
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Dec. 31, 2013
Acquisition Of Real Estate Properties [Member]
NBCUniversal Media, LLC [Member]
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| Weighted average original useful life (in years) | 11 | 6 | 5 | 21 | 20 | 6 | |||||||
| Cable distribution system | $ 30,498,000,000 | $ 29,528,000,000 | |||||||||||
| Customer premise equipment | 25,949,000,000 | 24,763,000,000 | |||||||||||
| Other equipment | 6,826,000,000 | 5,909,000,000 | |||||||||||
| Buildings and leasehold improvements | 8,057,000,000 | 5,468,000,000 | 5,239,000,000 | 3,223,000,000 | |||||||||
| Land | 1,084,000,000 | 989,000,000 | 799,000,000 | 728,000,000 | |||||||||
| Furniture, fixtures and equipment | 2,383,000,000 | 1,961,000,000 | |||||||||||
| Construction in process | 828,000,000 | 552,000,000 | |||||||||||
| Property and equipment, at cost | 72,414,000,000 | 66,657,000,000 | 9,249,000,000 | 6,464,000,000 | |||||||||
| Less: Accumulated depreciation | 42,574,000,000 | 39,425,000,000 | 1,599,000,000 | 1,083,000,000 | |||||||||
| Property and equipment, net | 29,840,000,000 | 27,232,000,000 | 7,650,000,000 | 5,381,000,000 | |||||||||
| Increases in property and equpiment related to real estate acquisitions | $ 2,200,000,000 | $ 1,700,000,000 | |||||||||||
| Equity interest acquired | 80.00% | ||||||||||||