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Acquisitions and Divestitures (Schedule of Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 4,723 $ 6,521 $ 8,965
Hospitals and Significant Practices Acquired [Member]      
Business Acquisition [Line Items]      
Current assets   7  
Property and equipment   69  
Goodwill   57  
Intangible assets   10  
Other long-term assets   3  
Liabilities   (10)  
Noncontrolling interests   (28)  
Total identifiable net assets   $ 108