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COMMITMENTS & CONTINGENCIES (Details)
$ in Millions
1 Months Ended
Sep. 30, 2021
plaintiff
Jan. 31, 2021
customer
Dec. 31, 2020
count
tranche
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 28, 2021
tranche
Loss Contingencies [Line Items]            
Accrued for legal and regulatory contingencies | $       $ 104 $ 85  
Number of tranches           3
Massachusetts Securities Law Violations            
Loss Contingencies [Line Items]            
Number of lawsuits | count     3      
Putative Securities Fraud Class Action Lawsuit            
Loss Contingencies [Line Items]            
Number of lawsuits     5      
March 2020 Outages            
Loss Contingencies [Line Items]            
Number of customers | plaintiff 400          
Putative Class Actions            
Loss Contingencies [Line Items]            
Number of customers | customer   2,000