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Acquisitions And Divestitures Acquisition of Winchester (Details) - USD ($) $ in Millions | Oct. 24, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 2,524 | $ 1,944 | $ 1,502
Winchester [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |
Business Combination, Consideration Transferred | $ 682 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 31 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 233 |  |  |
Other assets purchased and liabilities assumed, net | 25 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 289 |  |  |
Goodwill | 393 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 682 |  |  |
Customer Relationships [Member] | Winchester [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 9 years |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 187 |  |  |
Patented Technology [Member] | Winchester [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 9 |  |  |
Trade Names [Member] | Winchester [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 37 |  |  |

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