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Acquisitions and Dispositions (Dispositions Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 30, 2020
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Long Lived Assets Held-for-sale [Line Items]              
Proceeds from dispositions           $ 146 $ 755
Gain on sale of assets     $ 0 $ 0   $ 0 549
CBS Television City [Member]              
Long Lived Assets Held-for-sale [Line Items]              
Proceeds from dispositions         $ 750    
Guaranteed cash flow period         5 years    
Gain on sale of property and sound stage operation, net             $ 386
CNET Media Group [Member] | Disposition, Held-for-sale [Member] | Forecast [Member]              
Long Lived Assets Held-for-sale [Line Items]              
Gain on disposition   $ 245          
CNET Media Group [Member] | Disposition, Held-for-sale [Member] | Subsequent Event [Member]              
Long Lived Assets Held-for-sale [Line Items]              
CMG consideration $ 484            
Cash consideration 459            
Credit from sale $ 25            
Period credit can be used 5 years