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FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Cash received as collateral $ 218 $ 10
Securities received as collateral 102 405
Net derivative liability 515 $ 289
Counterparty Credit Risk    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Collateral, fair value 1,057  
Cash received as collateral 955  
Securities received as collateral 102  
Fair value of cash collateral posted 763  
Exposure to counterparties including interest net collateral, excluding embedded derivatives 358  
Net derivative liability $ 463