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Business Combinations and Divestitures Schedule of Business Acquisitions, by Acquisition - Zynstra (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 2,832 $ 2,692 $ 2,741
Zynstra Ltd. [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 76    
Goodwill 67    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities 10    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 1    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 134