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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sale of Closed Block of Commercial Long-Term Care Insurance Business (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Estimated pretax loss on sale of subsidiary   $ 0 $ 0 $ 270
Scenario, Forecast | KMG America Corporation | Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Estimated net loss on sale of subsidiary $ 365      
Estimated pretax loss on sale of subsidiary 780      
Estimated tax benefit on sale of subsidiary 415      
Parent company cash contributed to sale of subsidiary 203      
Transfer of statutory capital with sale of subsidiary $ 150