Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE SECURITIES - Collateralized Debt Obligation (Details)

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AVAILABLE-FOR-SALE SECURITIES - Collateralized Debt Obligation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Unrealized Gross Losses $ (416) $ (286)
Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gain (Loss) on Sale of Debt Investments $ 3