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Redeemable Noncontrolling Interests (Narrative) (Details)
$ in Millions
9 Months Ended
Nov. 06, 2018
Nov. 30, 2017
window
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 25, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interest balance     $ 414 $ 410 $ 413 $ 360   $ 237 $ 243
OWN                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interest balance     56            
MTG                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interest balance     121       $ 120    
Post-acquisition ownership percentage of the acquiror in the combined entity             67.50%    
MTG | GoldenTree Asset Management L.P.                  
Redeemable Noncontrolling Interest [Line Items]                  
Post-acquisition ownership percentage of the acquiror in the combined entity             32.50%    
Discovery Family                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interest balance     $ 210            
Ownership percentage by noncontrolling owners     40.00%            
Terms of put arrangement     1 year            
Discovery Japan                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interest balance     $ 27            
Ownership percentage by noncontrolling owners     20.00%            
Subsequent Acquisition, Window One | Harpo                  
Redeemable Noncontrolling Interest [Line Items]                  
Step acquisition, subsequent acquisition, number of window | window   4              
Step acquisition, subsequent acquisition, term of window   90 days              
Subsequent Acquisition, Window Two | Harpo                  
Redeemable Noncontrolling Interest [Line Items]                  
Step acquisition, subsequent acquisition, term of window   2 years 6 months              
Subsequent Acquisition, Window Two | Harpo | Subsequent Event                  
Redeemable Noncontrolling Interest [Line Items]                  
Step acquisition, put option redemption premium 9.337%                
Step acquisition, subsequent acquisition, term of window 2 years 6 months