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FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Cash received as collateral $ 103 $ 10
Securities received as collateral 350 405
Net derivative liability 357 $ 289
Counterparty Credit Risk    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Collateral, fair value 1,678  
Cash received as collateral 1,329  
Securities received as collateral 350  
Fair value of cash collateral posted 155  
Exposure to counterparties including interest net collateral, excluding embedded derivatives 288  
Net derivative liability $ 252