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Acquisitions And Divestitures Acquisition of Winchester (Details) - USD ($)
$ in Millions
Oct. 24, 2018
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 2,162 $ 1,944
Subsequent Event | Winchester [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Business Combination, Consideration Transferred $ 685    
Other assets purchased and liabilities assumed, net 75    
Goodwill 385    
Intangible assets $ 225