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Acquisitions And Divestitures Acquisition of Movimento Group (Details) - USD ($)
Jan. 03, 2017
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 2,162,000,000 $ 1,944,000,000
Movimento      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Purchase price, cash consideration, net of cash acquired $ 40,000,000    
Contingent consideration liability 8,000,000    
Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 10,000,000    
Contingent Consideration Period 2 years    
Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 0    
Business Combination, Consideration Transferred 48,000,000    
Intangible assets 22,000,000    
Other assets purchased and liabilities assumed, net (2,000,000)    
Identifiable net assets acquired 20,000,000    
Goodwill 28,000,000    
Total purchase price allocation $ 48,000,000    
Customer-Related Intangible Assets | Movimento      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 4,000,000    
Trade Names | Movimento      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 25 years    
Trade Names | Movimento      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 8,000,000    
In Process Research and Development | Movimento      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets $ 10,000,000