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Acquisitions and Divestitures (Divestitures Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 03, 2016
USD ($)
item
Feb. 01, 2016
USD ($)
item
Jan. 01, 2016
USD ($)
item
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Proceeds from Divestiture of Businesses, Net of Cash Divested           $ 12        
Impairment of goodwill             $ 1,400   $ 1,395  
Impairment and loss (gain) on sale of businesses, net         $ 250 17        
Goodwill, Written off Related to Disposal of Assets Held-for-Sale         $ 192          
Williamson Memorial Hospital [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of licensed beds | item         76          
Lehigh Regional Medical Center [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Disposal Date         Feb. 01, 2016          
Number of licensed beds | item     88              
Proceeds from Divestiture of Businesses, Net of Cash Divested     $ 11              
Impairment and loss (gain) on sale of businesses, net                   $ 4
Bartow Regional Medical Center [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Disposal Date         Jan. 01, 2016          
Number of licensed beds | item       72            
Proceeds from Divestiture of Businesses, Net of Cash Divested       $ 60            
Impairment and loss (gain) on sale of businesses, net                   $ 5
McNairy Regional Hospital [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Impairment and loss (gain) on sale of businesses, net           $ 7   $ 0    
Alliance Health Blackwell [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Disposal Date         Sep. 03, 2016          
Number of licensed beds | item   53                
Impairment and loss (gain) on sale of businesses, net   $ 3                
Home Care [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Disposal Date         Dec. 31, 2016          
Percentage of ownership interest sold 80.00%                 80.00%
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 128                  
Gain on sale                   $ 91