Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Recognized share-based compensation expense | $ 455 | $ 414 | $ 334 |
| NBCUniversal Media LLC [Member] | |||
| Recognized share-based compensation expense | 94 | 91 | 62 |
| Stock Options [Member] | |||
| Recognized share-based compensation expense | 157 | 160 | 139 |
| Stock Options [Member] | NBCUniversal Media LLC [Member] | |||
| Recognized share-based compensation expense | 10 | 16 | 15 |
| Restricted Share Units [Member] | |||
| Recognized share-based compensation expense | 273 | 231 | 175 |
| Restricted Share Units [Member] | NBCUniversal Media LLC [Member] | |||
| Recognized share-based compensation expense | 78 | 69 | 42 |
| Employee Stock Purchase Plan [Member] | |||
| Recognized share-based compensation expense | 25 | 23 | 20 |
| Employee Stock Purchase Plan [Member] | NBCUniversal Media LLC [Member] | |||
| Recognized share-based compensation expense | $ 6 | $ 6 | $ 5 |