Related Party Transactions - Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Revenue | $ 19,269 | $ 18,743 | $ 38,059 | $ 36,596 |
| NBCUniversal Media LLC [Member] | ||||
| Revenue | 7,103 | 7,230 | 13,964 | 13,834 |
| Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media LLC [Member] | ||||
| Revenue | 407 | 330 | 813 | 672 |
| Operating costs and expenses | (44) | (43) | (104) | (93) |
| Other income (expense) | $ (17) | $ (9) | $ (30) | $ (18) |