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Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 06, 2018
shares
Mar. 15, 2017
USD ($)
Jun. 30, 2018
shares
Mar. 31, 2018
USD ($)
series
$ / shares
shares
Mar. 31, 2017
shares
Dec. 31, 2017
USD ($)
Aug. 07, 2017
shares
Aug. 06, 2017
director
shares
Dec. 31, 2016
USD ($)
Class of Stock [Line Items]                  
Treasury stock, value | $       $ 6,737   $ 6,737      
Price paid per share, percentage of average price paid multiplied by conversion rate       99.00%          
Additional paid-in capital | $       $ 10,576   $ 7,295      
Historical stock repurchases, net of new issuances, as a percentage of shares outstanding at inception of stock repurchase program       33.00%          
Prepaid stock repurchase contract                  
Class of Stock [Line Items]                  
Cash settlement amount common stock repurchase contract | $   $ 58              
Prepaid repurchase of common stock | $                 $ 57
Cash premium received common stock repurchase contract | $   $ 1              
Advance Newhouse                  
Class of Stock [Line Items]                  
Number of preferred directors | director               3  
Series C Common Stock                  
Class of Stock [Line Items]                  
Treasury stock (in shares)       164,000,000          
Treasury stock, value | $       $ 6,600          
Common stock, conversion basis (in shares)               1  
Shares repurchased (in shares)       0 5,200,000        
Series A Common Stock                  
Class of Stock [Line Items]                  
Treasury stock (in shares)       3,000,000          
Treasury stock, value | $       $ 171          
Common stock, conversion basis (in shares)               1  
Preferred Stock                  
Class of Stock [Line Items]                  
Number of classes of stock | series       2          
Series A-1 Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Shares authorized (in shares)       8,000,000          
Series C-1 Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Shares authorized (in shares)       6,000,000          
Series C-1 Convertible Preferred Stock | Advance Programming Holdings, LLC                  
Class of Stock [Line Items]                  
Common stock, conversion basis (in shares)             19.3648    
Repurchases of preferred stock (in shares)       0 0        
Series C-1 Convertible Preferred Stock | Advance Programming Holdings, LLC | Scenario, Forecast                  
Class of Stock [Line Items]                  
Repurchases of preferred stock (in shares)     0            
Series A Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Liquidation preference per share (in dollars per share) | $ / shares       $ 0.01          
Series A Convertible Preferred Stock | Advance Newhouse                  
Class of Stock [Line Items]                  
Required ownership percentage to retain special voting rights       80.00%          
Scripps Networks Interactive | Series C Common Stock                  
Class of Stock [Line Items]                  
Issuance of stock in connection with acquisition (in shares) 139,000,000                
Equity interest issued or issuable (in shares) 1,000,000