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FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Cash received as collateral $ 10 $ 6
Securities received as collateral 405 442
Net derivative liability 289 $ 410
Counterparty Credit Risk    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Collateral, fair value 1,935  
Cash received as collateral 1,529  
Securities received as collateral 405  
Fair value of cash collateral posted 578  
Exposure to counterparties including interest net collateral, excluding embedded derivatives 361  
Net derivative liability $ 213