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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Expense) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 10,693,000 10,194,000 9,429,000
Additions based on tax positions 2,286,000 329,000 543,000
Additions (reductions) for tax positions of prior years 173,000 170,000 222,000
Settlement payments 0 0 0
Ending balance 13,152,000 10,693,000 10,194,000
Unrecognized tax benefits that would impact effective tax rate 10,700,000    
Public Service Company of New Mexico      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 7,776,000 7,288,000 6,563,000
Additions based on tax positions 2,286,000 329,000 543,000
Additions (reductions) for tax positions of prior years 168,000 159,000 182,000
Settlement payments 0 0 0
Ending balance 10,230,000 7,776,000 7,288,000
Unrecognized tax benefits that would impact effective tax rate 7,800,000    
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 114,000 103,000 63,000
Additions based on tax positions 0 0 0
Additions (reductions) for tax positions of prior years 5,000 11,000 40,000
Settlement payments 0 0 0
Ending balance 119,000 114,000 103,000
Unrecognized tax benefits that would impact effective tax rate 100,000    
Unrecognized tax benefits, interest on income taxes expense $ 0 $ 0 $ 0