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FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Net amount $ 252 $ 369
Counterparty credit risk    
Derivative [Line Items]    
Exposure to counterparties including interest net collateral, excluding embedded derivatives 404 392
Net amount $ 186 $ 307