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Description of Business and Basis of Presentation (Concentrations Risk) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Concentration Risk [Line Items]  
Derivative asset, fair value of collateral $ 3
Credit Risk  
Concentration Risk [Line Items]  
Derivative assets $ 58
Customer Concentration Risk | U.S. Networks | Largest 10 Distributors | Distribution  
Concentration Risk [Line Items]  
Concentration risk, percentage 96.00%
Customer Concentration Risk | International Networks | Largest 10 Distributors | Distribution  
Concentration Risk [Line Items]  
Concentration risk, percentage 39.00%