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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
FV of derivative instruments in net liability positions with credit risk related features, including normal purchase normal sale $ 26 $ 60
Collateral posted 0  
Additional collateral to post if credit-risk contingent features are triggered 26  
Outstanding Net Payable Balances for Settled Positions    
Derivative [Line Items]    
Additional collateral to post if credit-risk contingent features are triggered $ 21