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Business Combinations and Divestitures Schedule of Business Acquisitions, by Acquisition (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Business Acquisition, Share Price $ 5.05    
Business Acquisition, Transaction Costs $ 4    
Goodwill 2,692 $ 2,741 $ 2,727
Jet [Member]      
Business Acquisition [Line Items]      
Cash Acquired from Acquisition 4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 76    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 109    
Goodwill 96    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities (16)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (76)    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 193