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Acquisitions and Dispositions (Schedule of Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Net income available to Discovery, Inc. $ 107 $ 171
Scripps Networks Interactive, Harpo, and VTEN    
Business Acquisition [Line Items]    
Revenues $ 2,930 $ 2,569
Net income per share - basic (in dollars per share) $ 0.10 $ 0.20
Net income per share - diluted (in dollars per share) $ 0.10 $ 0.20