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Earnings Per Share (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 15, 2016
Series C Convertible Preferred Stock [Member]          
Weighted Average Number of Shares Outstanding, Diluted (in shares)     26 35  
Net income available to Discovery Communications, Inc. stockholders, Diluted $ 32 $ 44 $ 52 $ 74  
prepaid stock repurchase contract [Member]          
Prepaidrepurchaseofcommonstock         $ 57