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ACQUISITIONS AND DIVESTITURES (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of business   $ 0 $ 0 $ 270
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      
Pre-tax earnings       $ 411