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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

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