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Acquisitions and Dispositions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Other Healthcare Entity [Member]
Dec. 31, 2011
Other Healthcare Entity [Member]
Dec. 31, 2010
Other Healthcare Entity [Member]
Dec. 31, 2011
HealthONE [Member]
Dec. 31, 2012
HealthONE [Member]
Dec. 31, 2012
HealthONE [Member]
Hospitals [Member]
Hospital
Dec. 31, 2012
HealthONE [Member]
Freestanding surgery centers [Member]
Hospital
Dec. 31, 2012
Other [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Dec. 31, 2010
Other [Member]
Hospitals [Member]
Hospital
Dec. 31, 2012
Other [Member]
Hospitals [Member]
Dec. 31, 2011
Other [Member]
Hospitals [Member]
Dec. 31, 2012
Other [Member]
Other Healthcare Entity [Member]
Dec. 31, 2011
Other [Member]
Other Healthcare Entity [Member]
Dec. 31, 2010
Other [Member]
Other Healthcare Entity [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]                                                      
Equity interest, ownership percentage by parent                             40.00%                        
Purchase price of acquisition                             $ 1,450                        
Number Of Acquired Businesses                                 7 12       2          
Fair value of identifiable net assets of acquired entities         2,261         2,261                 232 68 125            
Gain on acquisition of business         1,424         1,522                                  
Increase in noncontrolling interests on business acquisition                               30                      
Decrease in property and equipment on business acquisition                               26                      
Increase in goodwill on business acquisition                               56                      
Expected tax deductible on the amount of goodwill related to acquisition                               981                      
Revenues 8,434 8,062 8,112 8,405 7,769 7,258 7,249 7,406 33,013 29,682 28,035       347                        
Net income 314 360 391 540 1,935 61 229 240 1,605 2,465 1,207       15                        
Cash paid for acquisition                                           163 58 136 200 96 70
Liability assumed on acquisition                                     33                
Proceeds from sale of business                       30 281 37                          
Pretax gain (loss) on sale of business                       15 142 4                          
Gain on sale of business after tax                       $ 9 $ 80 $ 2