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BENEFITS PAYABLE - Benefit Expenses Excluded From Activity in Benefits Payable (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Total future policy benefits $ (10) $ (23)
Operating Segments | Individual Commercial    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Total future policy benefits (16) (33)
Other Businesses    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Total future policy benefits $ 6 $ 10