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INVESTMENTS - DERIVATIVES GROSS COLLATERAL AMOUNTS ASSETS (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Total derivatives    
Offsetting Assets [Line Items]    
Fair Value of Assets $ 2,481 $ 1,954
Collateral (Received)/Held    
Financial Instruments 0 0
Cash (2,531) (1,828)
Net Amounts (50) 126
Other financial instruments    
Offsetting Assets [Line Items]    
Fair Value of Assets 1,803 2,995
Collateral (Received)/Held    
Financial Instruments 0 0
Cash 0 0
Net Amounts 1,803 2,995
Other invested assets    
Offsetting Assets [Line Items]    
Fair Value of Assets 4,284 4,949
Collateral (Received)/Held    
Financial Instruments 0 0
Cash (2,531) (1,828)
Net Amounts $ 1,753 $ 3,121