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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Expense) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, interest on income taxes expense $ 0 $ 0 $ 0
PNMR      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 13,152,000 10,693,000 10,194,000
Additions based on tax positions 305,000 2,286,000 329,000
Additions for tax positions of prior years 257,000 173,000 170,000
Settlement payments 0 0 0
Ending balance 13,714,000 13,152,000 10,693,000
Unrecognized tax benefits that would impact effective tax rate 11,600,000    
Public Service Company of New Mexico      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 10,230,000 7,776,000 7,288,000
Additions based on tax positions 295,000 2,286,000 329,000
Additions for tax positions of prior years 246,000 168,000 159,000
Settlement payments 0 0 0
Ending balance 10,771,000 10,230,000 7,776,000
Unrecognized tax benefits that would impact effective tax rate 8,600,000    
Unrecognized tax benefits, interest on income taxes expense 0 0 0
Texas-New Mexico Power Company      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 119,000 114,000 103,000
Additions based on tax positions 11,000 0 0
Additions for tax positions of prior years 11,000 5,000 11,000
Settlement payments 0 0 0
Ending balance 141,000 119,000 114,000
Unrecognized tax benefits that would impact effective tax rate 100,000    
Unrecognized tax benefits, interest on income taxes expense $ 0 $ 0 $ 0