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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2016
Jun. 27, 2016
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Business Acquisition [Line Items]          
Net purchase price       $ 101  
Goodwill     $ 476 $ 471 $ 476
Average useful life for each class of definite lived intangible asset recorded for acquisitions     5 years    
OneGuard [Member]          
Business Acquisition [Line Items]          
Net purchase price   $ 61      
Goodwill   57      
Other intangibles related to acquisitions   $ 15      
Landmark [Member]          
Business Acquisition [Line Items]          
Net purchase price $ 39        
Goodwill 37        
Other intangibles related to acquisitions $ 13