XML 114 R98.htm IDEA: XBRL DOCUMENT v3.23.2
Income Taxes (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2017
Income Tax Contingency [Line Items]    
Effective tax rate 15.68%  
Income tax assessment $ 0.3  
Deferred federal, state and local, income taxes $ 22.9  
PNM    
Income Tax Contingency [Line Items]    
Effective tax rate 18.69%  
Income tax assessment $ 0.2  
Deferred federal, state and local, income taxes $ 14.3  
TNMP    
Income Tax Contingency [Line Items]    
Effective tax rate 14.72%  
Income tax assessment $ 0.1  
Deferred federal, state and local, income taxes $ 8.6  
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