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Acquisitions And Divestitures Acquisition of KUM (Details) - USD ($) $ in Millions	Jun. 14, 2018	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,162	$ 1,944
KUM
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Purchase price, cash consideration, net of cash acquired	$ 512
Business Combination, Consideration Transferred, Liabilities Incurred	11
Business Combination, Consideration Transferred	523
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	123
Intangible assets	110
Other assets purchased and liabilities assumed, net	36
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	269
Goodwill	254
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 523
Customer Relationships [Member] | KUM
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years

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