v3.6.0.2
Postretirement, Pension and Other Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer Plans, Funded Status At least 80 percent    
Severance Costs $ 315 $ 181 $ 152
Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Funded percentage 80.00%    
DreamWorks Animation [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Severance Costs $ 61    
NBCUniversal Media LLC [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer Plans, Funded Status At least 80 percent    
Severance Costs $ 165 113 113
NBCUniversal Media LLC [Member] | Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Funded percentage 80.00%    
NBCUniversal Media LLC [Member] | DreamWorks Animation [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Severance Costs $ 61    
Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit obligation 314 309  
Mutliemployer plan contributions 84 77 58
Pension Plan [Member] | NBCUniversal Media LLC [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit obligation 314 309  
Mutliemployer plan contributions 84 77 58
NBCUniversal Legacy Qualified Pension Plans [Member] | NBCUniversal Media LLC [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit obligations in excess of plan assets 62 67  
Deferred Compensation Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Cash surrender value of life insurance policies 709 658  
Retirement Investment Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expenses related to retirement investment plans 446 416 379
Retirement Investment Plans [Member] | NBCUniversal Media LLC [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expenses related to retirement investment plans 185 174 165
Postretirement and Other Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Mutliemployer plan contributions 136 119 125
Postretirement and Other Benefits [Member] | NBCUniversal Media LLC [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Mutliemployer plan contributions 136 $ 119 $ 125
Stipend Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Reduction of benefit obligations due to plan amendments $ 361