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NET OPERATING REVENUES - Ambulatory Care (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Net operating revenues  $ 4,954 $ 3,648 $ 9,735 $ 8,168
Ambulatory Care        
Disaggregation of Revenue [Line Items]        
Net operating revenues  664 368 1,310 858
Ambulatory Care | Net patient service revenues        
Disaggregation of Revenue [Line Items]        
Net operating revenues  638 349 1,257 813
Ambulatory Care | Management fees        
Disaggregation of Revenue [Line Items]        
Net operating revenues  21 16 43 37
Ambulatory Care | Revenue from other sources        
Disaggregation of Revenue [Line Items]        
Net operating revenues  $ 5 $ 3 $ 10 $ 8