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FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Net amount $ 270 $ 587
Counterparty Credit Risk    
Derivative [Line Items]    
Exposure to counterparties including interest net collateral, excluding embedded derivatives 227 95
Net amount $ 250 $ 571