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Investments (Carrying Amount Of Equity Method Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 314 $ 297  
EPIX      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 31.15%   31.15%
Equity method investments $ 179 172  
Pop      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments $ 94 99  
Other      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 41 $ 26