Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Settlement Of Station Venture Liability | $ 602 | ||
| Other noncurrent liabilities | $ 10,637 | $ 10,819 | |
| NBCUniversal Media LLC [Member] | |||
| Revolving Credit Agreement Capacity | 3,000 | ||
| Collateral Liability For Unconsolidated Subsidiary Debt | 482 | ||
| Borrowing margin for LIBOR based borrowings | 1.00% | ||
| Settlement Of Station Venture Liability | $ 0 | 0 | 602 |
| Redemption Transaction Distribution | 0 | 0 | $ 3,200 |
| Other noncurrent liabilities | 3,790 | 3,721 | |
| NBCUniversal Holdings Preferred Stock [Member] | NBCUniversal Media LLC [Member] | |||
| Preferred stock liquidation preference value | $ 9,400 | ||
| Preferred stock dividend rate percentage | 8.25% | ||
| Carrying Value Of Related Party Contractual Obligation [Member] | NBCUniversal Media LLC [Member] | |||
| Other noncurrent liabilities | $ 383 | $ 383 | |