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Acquisitions And Divestitures Acquisition of nuTonomy (Details) - USD ($)
Nov. 21, 2017
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 2,162,000,000 $ 1,944,000,000
nuTonomy      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 454,000,000    
Purchase price, cash consideration, net of cash acquired $ 284,000,000    
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
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    
Deferred Compensation, Payable after 3 years $ 51,000,000    
Business Combindation, Deferred Compensation period 3 years    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 54,000,000    
Contingent Consideration Period 3 years    
Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 0    
Contingent consideration liability 24,000,000    
Business Combination, Consideration Transferred 308,000,000    
Intangible assets 102,000,000    
Other assets purchased and liabilities assumed, net (40,000,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 62,000,000    
Goodwill 246,000,000    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 308,000,000