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Dispositions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 30, 2020
Dec. 31, 2020
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2019
CBS Television City [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Sale of property and sound stage         $ 750
Guaranteed cash flow period         5 years
Gain on sales         $ 549
Gain on sale of property and sound stage operation, net     $ 386   $ 386
Simon & Schuster [Member] | Discontinued Operations, Disposed of by Sale [Member] | Forecast [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Proceeds from dispositions       $ 2,175  
CNET Media Group [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Long Lived Assets Held-for-sale [Line Items]          
CMG consideration $ 484        
Proceeds from dispositions 459        
Credit from sale 25        
Gain on disposition 214 $ 214      
Gain on disposition, net $ 183 $ 183