Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Recognized share-based compensation expense | $ 145 | $ 129 | $ 260 | $ 230 |
| NBCUniversal Media LLC [Member] | ||||
| Recognized share-based compensation expense | 31 | 29 | 54 | 50 |
| Restricted Share Units [Member] | ||||
| Recognized share-based compensation expense | 89 | 80 | 159 | 138 |
| Restricted Share Units [Member] | NBCUniversal Media LLC [Member] | ||||
| Recognized share-based compensation expense | 27 | 24 | 45 | 41 |
| Stock Options [Member] | ||||
| Recognized share-based compensation expense | 48 | 43 | 85 | 78 |
| Stock Options [Member] | NBCUniversal Media LLC [Member] | ||||
| Recognized share-based compensation expense | 2 | 3 | 4 | 5 |
| Employee Stock Purchase Plan [Member] | ||||
| Recognized share-based compensation expense | 8 | 6 | 16 | 14 |
| Employee Stock Purchase Plan [Member] | NBCUniversal Media LLC [Member] | ||||
| Recognized share-based compensation expense | $ 2 | $ 2 | $ 5 | $ 4 |