ACQUISITIONS AND DIVESTITURES (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 01, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||||
| Gain on sale of business | $ 0 | $ 0 | $ 0 | $ 267 | |
| Concentra Inc. | |||||
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||||
| Selling price in cash | $ 1,055 | ||||
| Disposal transaction costs | 22 | ||||
| Gain on sale of business | $ 270 | ||||
| Revenues | 411 | ||||
| Pretax earnings | $ 15 | ||||