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Acquisitions (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
item
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Net purchase price   $ 5    
Goodwill $ 512   $ 512 $ 501
Business acquisition, cash from operations   $ 5    
Number of acquisitions during period | item 0      
Streem [Member]        
Business Acquisition [Line Items]        
Intangible assets reclassified to goodwill     14  
Goodwill $ 35   35  
Other intangibles related to acquisitions 24   24  
Deferred tax liability, amount used to offset acquired intangible assets $ 4   $ 4