|
Long-Term Debt (Details)
In Millions, unless otherwise specified |
Dec. 31, 2013
USD ($)
|
Dec. 31, 2012
USD ($)
|
Dec. 31, 2013
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2012
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2013
Revolving bank credit facility [Member]
|
Dec. 31, 2013
Comcast Commercial Paper Program
|
Dec. 31, 2013
Senior notes with maturities of 5 years or less [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities of 5 years or less [Member]
USD ($)
|
Dec. 31, 2013
Senior notes with maturities of 5 years or less [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities of 5 years or less [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2013
Senior notes with maturities between 6 and 10 years [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities between 6 and 10 years [Member]
USD ($)
|
Dec. 31, 2013
Senior notes with maturities between 6 and 10 years [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities between 6 and 10 years [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2013
Senior notes with maturities greater than 10 years [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities greater than 10 years [Member]
USD ($)
|
Dec. 31, 2013
Senior notes with maturities greater than 10 years [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2012
Senior notes with maturities greater than 10 years [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2013
Other Including Capital Lease Obligations [Member]
USD ($)
|
Dec. 31, 2012
Other Including Capital Lease Obligations [Member]
USD ($)
|
Dec. 31, 2013
Other Including Capital Lease Obligations [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2012
Other Including Capital Lease Obligations [Member]
NBCUniversal Media, LLC [Member]
USD ($)
|
Dec. 31, 2013
Notes 5.50% Due 2029 [Member]
USD ($)
|
Dec. 31, 2013
Notes 5.50% Due 2029 [Member]
GBP (£)
|
Dec. 31, 2012
Notes 5.50% Due 2029 [Member]
USD ($)
|
Dec. 31, 2012
Notes 5.50% Due 2029 [Member]
GBP (£)
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Commercial paper | $ 1,350 | |||||||||||||||||||||||||
| Revolving credit facilities | 1,250 | |||||||||||||||||||||||||
| Senior notes | 15,080 | 12,991 | 2,917 | 2,933 | 11,533 | 10,334 | 4,996 | 3,999 | 18,010 | 16,801 | 3,205 | 4,203 | 1,000 | 625 | 1,000 | 625 | ||||||||||
| Other, including capital lease obligations | 624 | 332 | 47 | 106 | ||||||||||||||||||||||
| Total debt | 47,847 | 40,458 | 11,165 | 11,241 | ||||||||||||||||||||||
| Less: current portion | 3,280 | 2,376 | 906 | 10 | ||||||||||||||||||||||
| Long-term debt | $ 44,567 | $ 38,082 | $ 10,259 | $ 11,231 | ||||||||||||||||||||||
| Weighted average interest rate | 4.80% | 4.22% | 1.166% | 0.295% | 4.718% | 2.884% | 4.558% | 4.388% | 5.971% | 5.614% | ||||||||||||||||
| Borrowing Margin Libor Based Borrowings | 1.00% |