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INVESTMENTS (Equity Method Investments) (Details) - Harrington Reinsurance Holdings Limited
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]  
Payments to acquire equity method investments $ 108
Equity method investment, ownership percentage 19.00%
Equity method investment, difference between carrying amount and underlying equity $ 5