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Acquisitions And Divestitures Acquisition of nuTonomy, Inc (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Nov. 21, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 16,000,000 | $ 50,000,000 | $ 3,000,000
Goodwill |  | $ 2,524,000,000 | $ 1,944,000,000 | $ 1,502,000,000
nutonomy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |
Business Combination, Maximum Total Consideration | $ 454,000,000 |  |  |
Deferred Compensation, Payable after three years | 51,000,000 |  |  |
Business Combination, Consideration Transferred | 308,000,000 |  |  |
Payments to Acquire Businesses, Gross | 284,000,000 |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 109,000,000 |  |  |
Deferred Compensation, Payable after one year | 7,000,000 |  |  |
Deferred compensation, payable after two years | 51,000,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 54,000,000 |  |  |
Contingent Consideration Period | 3 years |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | $ 0 |  |  |
Business Combination, Contingent Consideration, Liability | 24,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 102,000,000 |  |  |
Other assets purchased and liabilities assumed, net | (35,000,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 67,000,000 |  |  |
Goodwill | 241,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 308,000,000 |  |  |

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