Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Weighted average interest rate of debt outstanding.

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Amount borrowed under the credit facility as of the balance sheet date.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Long-Term Debt (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2013 NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2014 Revolving bank credit facility [Member]	Dec. 31, 2014 Commercial Paper Program	Dec. 31, 2014 Senior notes with maturities of 5 years or less [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities of 5 years or less [Member] USD ($)	Dec. 31, 2014 Senior notes with maturities of 5 years or less [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities of 5 years or less [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2014 Senior notes with maturities between 5 and 10 years [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities between 5 and 10 years [Member] USD ($)	Dec. 31, 2014 Senior notes with maturities between 5 and 10 years [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities between 5 and 10 years [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2014 Senior notes with maturities greater than 10 years [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities greater than 10 years [Member] USD ($)	Dec. 31, 2014 Senior notes with maturities greater than 10 years [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2013 Senior notes with maturities greater than 10 years [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2014 Other Including Capital Lease Obligations [Member] USD ($)	Dec. 31, 2013 Other Including Capital Lease Obligations [Member] USD ($)	Dec. 31, 2014 Other Including Capital Lease Obligations [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2013 Other Including Capital Lease Obligations [Member] NBCUniversal Media, LLC [Member] USD ($)	Dec. 31, 2014 Notes 5.50% Due 2029 [Member] USD ($)	Dec. 31, 2014 Notes 5.50% Due 2029 [Member] GBP (£)	Dec. 31, 2013 Notes 5.50% Due 2029 [Member] USD ($)	Dec. 31, 2013 Notes 5.50% Due 2029 [Member] GBP (£)
Commercial paper	$ 845,000,000us-gaap_CommercialPaper	$ 1,350,000,000us-gaap_CommercialPaper
Revolving credit facilities	0	1,250,000,000
Senior notes							15,334,000,000	15,080,000,000	2,005,000,000	2,917,000,000	10,527,000,000	11,533,000,000	4,996,000,000	4,996,000,000	20,937,000,000	18,010,000,000	3,204,000,000	3,205,000,000					974,000,000	625,000,000	1,000,000,000	625,000,000
Other, including capital lease obligations																			591,000,000	624,000,000	44,000,000	47,000,000
Total debt	48,234,000,000us-gaap_DebtAndCapitalLeaseObligations	47,847,000,000us-gaap_DebtAndCapitalLeaseObligations	10,249,000,000	11,165,000,000
Less: current portion	4,217,000,000us-gaap_DebtCurrent	3,280,000,000us-gaap_DebtCurrent	1,023,000,000	906,000,000
Long-term debt, less current portion	$ 44,017,000,000	$ 44,567,000,000	$ 9,226,000,000	$ 10,259,000,000
Weighted average interest rate	4.95%us-gaap_DebtWeightedAverageInterestRate		4.46%		0.00%	0.373%	4.642%		3.254%		4.822%		4.389%		5.737%		5.614%