v3.6.0.2
Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense $ 507 $ 455 $ 414
NBCUniversal Media LLC [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 99 94 91
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 306 273 231
Restricted Stock Units (RSUs) [Member] | NBCUniversal Media LLC [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 82 78 69
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 173 157 160
Employee Stock Option [Member] | NBCUniversal Media LLC [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 9 10 16
Employee Stock Purchase Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense 28 25 23
Employee Stock Purchase Plans [Member] | NBCUniversal Media LLC [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense $ 8 $ 6 $ 6