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COMMITMENTS AND CONTINGENCIES - OTHER LITIGATION (Details)
claim in Thousands, £ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Oct. 31, 2020
GBP (£)
Mar. 31, 2020
GBP (£)
Mar. 31, 2022
USD ($)
Apr. 29, 2022
claim
Plaintiffs | HMRC VAT Claim        
Loss Contingencies [Line Items]        
Damages awarded   £ 45 $ 59  
Cost and interest assessed £ 21   $ 28  
Energy Future Holdings Corp. | Subsequent Event        
Loss Contingencies [Line Items]        
Number of proof of claims       28