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Financing - Short-term Debt and Liquidity (Details)
Dec. 08, 2023
Jan. 26, 2023
USD ($)
extension_option
May 20, 2022
USD ($)
extension_option
Mar. 11, 2022
USD ($)
extension_option
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 13, 2022
USD ($)
Mar. 10, 2022
USD ($)
Short-term Debt [Line Items]                
Letters of credit outstanding         $ 3,100,000      
JPMorgan Chase Bank, N.A.                
Short-term Debt [Line Items]                
Letters of credit outstanding         30,300,000      
PNMR Revolving Credit Facility                
Short-term Debt [Line Items]                
Financing capacity   $ 285,000,000     $ 300,000,000      
PNMR Revolving Credit Facility | PNM Resources                
Short-term Debt [Line Items]                
Interest rates on outstanding borrowings         6.96%      
PNM Revolving Credit Facility | PNM Resources                
Short-term Debt [Line Items]                
Interest rates on outstanding borrowings         6.69%      
TNMP Revolving Credit Facility | PNM Resources                
Short-term Debt [Line Items]                
Interest rates on outstanding borrowings         6.32%      
PNM New Mexico Credit Facility | PNM Resources                
Short-term Debt [Line Items]                
Interest rates on outstanding borrowings         6.71%      
PNM                
Short-term Debt [Line Items]                
Letters of credit outstanding         $ 0      
PNM | Lines of credit                
Short-term Debt [Line Items]                
NMPRC approved credit facility     $ 40,000,000          
PNM | PNM Revolving Credit Facility                
Short-term Debt [Line Items]                
Financing capacity   $ 380,000,000     400,000,000      
TNMP                
Short-term Debt [Line Items]                
Letters of credit outstanding         $ 0      
TNMP | TNMP Revolving Credit Facility                
Short-term Debt [Line Items]                
Financing capacity           $ 75,000,000    
TNMP | TNMP Revolving Credit Facility | First Mortgage Bonds at 9.50% due 2019                
Short-term Debt [Line Items]                
Aggregate principal amount of bonds           $ 75,000,000    
Revolving Credit Facility                
Short-term Debt [Line Items]                
Number of extensions | extension_option     2          
Extension period 1 year 1 year 1 year          
Extension exercised | extension_option   1            
Revolving Credit Facility | TNMP                
Short-term Debt [Line Items]                
Financing capacity       $ 100,000,000     $ 100,000,000 $ 75,000,000
Number of extensions | extension_option       2        
Extension period   1 year   1 year        
Extension exercised | extension_option   1            
Revolving Credit Facility | TNMP | First Mortgage Bonds at 9.50% due 2019                
Short-term Debt [Line Items]                
Collateral amount             $ 100,000,000