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Acquisitions And Divestitures Acquisition of KUM (Details) - USD ($) $ in Millions	Jun. 14, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 2,524	$ 1,944	$ 1,502
Kum [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Purchase price, cash consideration, net of cash acquired	$ 515
Business Combination, Consideration Transferred, Liabilities Incurred	11
Business Combination, Consideration Transferred	526
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	121
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	110
Other assets purchased and liabilities assumed, net	31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	262
Goodwill	264
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 526
Customer Relationships [Member] | Kum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years

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