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Income Taxes (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2022
Dec. 31, 2017
Dec. 31, 2020
Income Tax Contingency [Line Items]          
Accelerated refund application amount of AMT tax, CARES act         $ 5.2
Deferred tax assets, tax deferred expense, payroll taxes, CARES Act         $ 7.0
Refund amount of AMT tax, CARES act   $ 5.2      
Payment of payroll taxes, CARES Act $ 3.5        
Deferred federal, state and local, income taxes     $ 23.6    
Effective tax rate     10.78%    
PNM          
Income Tax Contingency [Line Items]          
Deferred federal, state and local, income taxes     $ 14.4    
Effective tax rate     11.92%    
TNMP          
Income Tax Contingency [Line Items]          
Deferred federal, state and local, income taxes     $ 9.2    
Effective tax rate     13.26%    
NMPRC          
Income Tax Contingency [Line Items]          
Period of time for proposed return to customers the benefit of the reduction in federal corporate income tax rate       23 years  
Period of time for proposed return to customers the benefit of the reduction in New Mexico's corporate income tax rate       3 years