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DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items]    
Notional $ 447 $ 434
Cash flow hedges | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional 275 267
Effective Portion 5 5
Ineffective Portion $ 0 $ 0