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Revenue - Performance Obligation, Narrative (Details) - Network, Advertising and Broadcasting
Jun. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Remaining performance obligation period 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Remaining performance obligation period 60 months