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Merger (Details) - Forecast - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Avangrid | Iberdrola, S.A.    
Business Acquisition [Line Items]    
Noncontrolling interest, ownership percentage by parent   81.50%
Merger Agreement    
Business Acquisition [Line Items]    
Business combination, cash right per common share (in dollars per share)   $ 50.30
Out-of-pocket fees and expenses reimbursement $ 10.0  
Merger Agreement | PNMR    
Business Acquisition [Line Items]    
Termination fees 130.0  
Merger Agreement | Avangrid    
Business Acquisition [Line Items]    
Termination fees $ 184.0