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BASIS OF PRESENTATION - Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts $ 4,941 $ 5,216 $ 15,310 $ 15,856
Operating segments | Hospital Operations and other        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 4,212 4,520 13,148 13,829
Operating segments | Hospital Operations and other | Medicare        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 809 844 2,563 2,658
Operating segments | Hospital Operations and other | Medicaid        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 256 339 822 1,009
Operating segments | Hospital Operations and other | Managed care        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 2,524 2,729 7,867 8,031
Operating segments | Hospital Operations and other | Indemnity, self-pay and other        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 442 328 1,316 1,264
Operating segments | Hospital Operations and other | Net patient revenues        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 4,031 4,240 12,568 12,962
Operating segments | Hospital Operations and other | Health plans        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 10 122 100 385
Operating segments | Hospital Operations and other | Revenue from other sources        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 171 158 480 482
Operating segments | Hospital Operations and other | Physician practices        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 171 179 551 558
Operating segments | Ambulatory Care | Ambulatory Care        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 477 457 1,422 1,346
Operating segments | Conifer | Conifer        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts 401 398 1,203 1,169
Inter-segment eliminations        
Supplemental payments and net operating revenues        
Net operating revenues before provision for doubtful accounts $ (149) $ (159) $ (463) $ (488)