Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Debt issuance cost | $ 176 | |
| NBCUniversal Media LLC [Member] | ||
| Debt issuance cost | $ 11 | |
| Debt Issuance Costs New Account Pronouncement - Reduction of Long Term Debt [Member] | ||
| New accounting pronouncement, early adoption, effect on balance sheet | $ 153 | |
| Debt Issuance Costs New Account Pronouncement - Reduction of Long Term Debt [Member] | NBCUniversal Media LLC [Member] | ||
| New accounting pronouncement, early adoption, effect on balance sheet | 12 | |
| Deferred Income Taxes New Accounting Pronouncement Reclass to Long Term Liabilities [Member] | ||
| New Accounting Pronouncement, early adoption, effect on balance sheet if retrospectively adopted | $ 195 | |