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DERIVATIVE INSTRUMENTS - Notional Amounts and Fair Values of Derivatives (Details) - Interest rate lock commitments - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Notional Amount $ 21 $ 15
Interest rate lock commitments 0 0
Fair Value Derivatives, Liability $ 0 $ 0