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Acquisitions and Divestitures (Acquisitions Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Business Combination, Acquisition Related Costs $ 1 $ 1
Physician Practices Clinics and Other Ancillary Businesses [Member]    
Business Acquisition [Line Items]    
Business Acquisition, Cost of Acquired Entity, Purchase Price 8  
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment 2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 6