NET OPERATING REVENUES - Ambulatory Care (Details) - Hospital Operations and other - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Disaggregation of Revenue [Line Items] | ||
| Net operating revenues | $ 498 | $ 455 |
| Net patient service revenues less provision for doubtful accounts | ||
| Disaggregation of Revenue [Line Items] | ||
| Net operating revenues | 469 | 428 |
| Management fees | ||
| Disaggregation of Revenue [Line Items] | ||
| Net operating revenues | 23 | 21 |
| Revenue from other sources | ||
| Disaggregation of Revenue [Line Items] | ||
| Net operating revenues | $ 6 | $ 6 |