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Business Combinations and Divestitures Purchase Price Allocation (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 2,754 $ 2,692
D3 Technology [Member]    
Business Acquisition [Line Items]    
Cash acquired 9  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 6  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 20  
Goodwill 54  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 3  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (8)  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 84