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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Apr. 30, 2013
Commitments and Contingencies Disclosure [Abstract]      
Programming and copyright costs $ 111 $ 96  
Indemnification agreement      
Loss Contingencies [Line Items]      
Indemnifications provided (up to)     $ 300