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Earnings Per Share (Schedule of Weighted-Average Number of Shares Outstanding) (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
Series A, B and C Common Stock [Member]        
Weighted average number of shares outstanding, basic (in shares) 384 404 387 409
Weighted average dilutive effect of assumed preferred stock conversion (in shares) 192 208 193 211
Dilutive effect of share-based awards (in shares) 2 4 3 3
Weighted Average Number of Shares Outstanding, Diluted (in shares) 578 616 583 623
Net income available to Discovery Communications, Inc. stockholders, Diluted $ 374 $ 408 $ 589 $ 671
Series C Convertible Preferred Stock [Member]        
Weighted average number of shares outstanding, basic (in shares) 25 33 26 35
Weighted Average Number of Shares Outstanding, Diluted (in shares)     26 35
Net income available to Discovery Communications, Inc. stockholders, Diluted $ 32 $ 44 $ 52 $ 74