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Acquisition and Investments (Investments Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments [Line Items]      
Value of equity method investments $ 494 $ 573  
Investments readily determinable fair value 113 112  
Marketable securities 146 34  
Gain (loss) on marketable securities 113 (23) $ 0
Investments in and advances to investee companies 171 161 128
Gain on sale of equity method investment 0 0 285
Write-down of investments 50 46 18
Other Items, Net [Member]      
Investments [Line Items]      
Write-down of investments 50 46 18
Level 1 [Member]      
Investments [Line Items]      
Marketable securities 146 34  
International Joint Venture [Member]      
Investments [Line Items]      
Gain on sale of equity method investment $ 10    
Viacom18 [Member]      
Investments [Line Items]      
Proceeds from sale of equity method investment   20  
Gain on sale of equity method investment   $ 16  
EPIX [Member]      
Investments [Line Items]      
Proceeds from sale of equity method investment     593
Gain on sale of equity method investment     285
Transaction costs associated with disposition of equity method investment     4
Dividend paid     $ 37
Viacom18 [Member]      
Investments [Line Items]      
Equity interest in investees   1.00%  
EPIX [Member]      
Investments [Line Items]      
Equity interest in investees     49.76%
Equity Method Investees [Member] | The C W [Member]      
Investments [Line Items]      
Equity interest in investees 50.00%    
Equity Method Investees [Member] | AMC Networks Inc JV [Member]      
Investments [Line Items]      
Equity interest in investees 49.00%    
Equity Method Investees [Member] | AMC Networks Inc Other JV [Member]      
Investments [Line Items]      
Equity interest in investees 30.00%    
Equity Method Investees [Member] | Viacom18 [Member]      
Investments [Line Items]      
Equity interest in investees 49.00%    
Other Assets [Member]      
Investments [Line Items]      
Investments $ 753 $ 719