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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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