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Acquisitions (Other Acquisitions Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Payments to acquire business, net $ 147 $ 399  
PlutoTV [Member]      
Business Acquisition [Line Items]      
Payments to acquire business, net   324  
Post-combination expenses   $ 18  
POP [Member]      
Business Acquisition [Line Items]      
Percentage of voting interests acquired   50.00%  
Purchase price   $ 39  
Remaining ownership acquired   100.00%  
Other Acquisitions [Member]      
Business Acquisition [Line Items]      
Payments to acquire business, net     $ 118