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Financing - Long-term Debt (Details) - USD ($)
Jun. 22, 2020
Mar. 09, 2018
Dec. 31, 2020
Dec. 22, 2020
Dec. 21, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 18, 2019
Jan. 18, 2019
Dec. 21, 2018
Debt Instrument [Line Items]                    
Total     $ 3,294,043,000       $ 3,004,043,000      
Principal, less current maturities     576,000,000       490,345,000      
Long-term debt, excluding current maturities, gross     2,718,043,000       2,513,698,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     (1,107,000)       (3,674,000)      
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities     482,000       77,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities     (1,589,000)       (3,751,000)      
PNMR 2018 Two-Year Term Loan due December 2020                    
Debt Instrument [Line Items]                    
Aggregate principal amount                   $ 50,000,000.0
Term loans         $ 50,000,000.0          
PNMR 2020 Term Loan due January 2022                    
Debt Instrument [Line Items]                    
Term loans         $ 150,000,000.0          
PNMR 2020 Delayed-Draw Term Loan due January 2022                    
Debt Instrument [Line Items]                    
Term loans     $ 80,000,000.0 $ 300,000,000.0            
Bonds                    
Debt Instrument [Line Items]                    
Repayments of debt $ 302,500,000                  
Bonds | Pollution Control Revenue Bonds                    
Debt Instrument [Line Items]                    
Aggregate principal amount           $ 100,300,000        
Term loans             100,300,000      
Stated percentage     0.19%              
Senior Unsecured Notes: | PNMR 3.25% 2018 SUNs due March 2021                    
Debt Instrument [Line Items]                    
Aggregate principal amount   $ 300,000,000.0                
Term loans   $ 220,000,000.0                
Stated percentage   3.25%                
Public Service Company of New Mexico                    
Debt Instrument [Line Items]                    
Total     $ 1,705,845,000       1,755,845,000      
Principal, less current maturities     346,000,000       350,345,000      
Long-term debt, excluding current maturities, gross     1,359,845,000       1,405,500,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     9,225,000       7,825,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities     430,000       77,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities     $ 8,795,000       7,748,000      
Public Service Company of New Mexico | PNM 2019 $250.0 Million Term Loan due July 2020                    
Debt Instrument [Line Items]                    
Aggregate principal amount                 $ 250,000,000.0  
Public Service Company of New Mexico | PNM 2019 $40.0 Million Term Loan due June 2021                    
Debt Instrument [Line Items]                    
Aggregate principal amount               $ 40,000,000.0    
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.875% due April 2033, mandatory tender - October 1, 2021                    
Debt Instrument [Line Items]                    
Stated percentage     1.875%              
Unsecured long-term debt, noncurrent     $ 146,000,000       146,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 301,000       662,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 6.25% due January 2038                    
Debt Instrument [Line Items]                    
Stated percentage     6.25%              
Unsecured long-term debt, noncurrent     $ 0       36,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       205,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.125% due June 2040, mandatory tender - June 1, 2022                    
Debt Instrument [Line Items]                    
Stated percentage     2.125%              
Unsecured long-term debt, noncurrent     $ 37,000,000       37,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 135,000       224,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.20% due June 2040, mandatory tender - June 1, 2020                    
Debt Instrument [Line Items]                    
Stated percentage     5.20%              
Unsecured long-term debt, noncurrent     $ 0       40,045,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       17,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.90% due June 2040                    
Debt Instrument [Line Items]                    
Stated percentage     5.90%              
Unsecured long-term debt, noncurrent     $ 0       255,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       1,857,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 6.25% due June 2040                    
Debt Instrument [Line Items]                    
Stated percentage     6.25%              
Unsecured long-term debt, noncurrent     $ 0       11,500,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       84,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.45% due September 2042, mandatory tender - June 1, 2022                    
Debt Instrument [Line Items]                    
Stated percentage     2.45%              
Unsecured long-term debt, noncurrent     $ 20,000,000       20,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 50,000       85,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.40% due June 2043, mandatory tender - June 1, 2020                    
Debt Instrument [Line Items]                    
Stated percentage     2.40%              
Unsecured long-term debt, noncurrent     $ 0       39,300,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       50,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.20% due June 2043, mandatory tender - June 1, 2020                    
Debt Instrument [Line Items]                    
Stated percentage     5.20%              
Unsecured long-term debt, noncurrent     $ 0       21,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       10,000      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | Floating rate, weekly-mode                    
Debt Instrument [Line Items]                    
Unsecured long-term debt, noncurrent     100,345,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 798,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.05% due January 2038, mandatory tender - June 1, 2022                    
Debt Instrument [Line Items]                    
Stated percentage     1.05%              
Unsecured long-term debt, noncurrent     $ 36,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 226,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.20% due June 2040, mandatory tender - June 1, 2022                    
Debt Instrument [Line Items]                    
Stated percentage     1.20%              
Unsecured long-term debt, noncurrent     $ 11,500,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 72,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.10% due June 2040, mandatory tender June 1, 2023                    
Debt Instrument [Line Items]                    
Stated percentage     1.10%              
Unsecured long-term debt, noncurrent     $ 130,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 892,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.15% due June 2040, mandatory tender - June 1, 2024                    
Debt Instrument [Line Items]                    
Stated percentage     1.15%              
Unsecured long-term debt, noncurrent     $ 125,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 894,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes: | 5.35% due October 2021                    
Debt Instrument [Line Items]                    
Stated percentage     5.35%              
Unsecured long-term debt, noncurrent     $ 160,000,000       160,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 129,000       292,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.15% due May 2023                    
Debt Instrument [Line Items]                    
Stated percentage     3.15%              
Unsecured long-term debt, noncurrent     $ 55,000,000       55,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 184,000       261,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.45% due May 2025                    
Debt Instrument [Line Items]                    
Stated percentage     3.45%              
Unsecured long-term debt, noncurrent     $ 104,000,000       104,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 457,000       562,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.85% due August 2025                    
Debt Instrument [Line Items]                    
Stated percentage     3.85%              
Unsecured long-term debt, noncurrent     $ 250,000,000       250,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 1,375,000       1,675,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.68% due May 2028                    
Debt Instrument [Line Items]                    
Stated percentage     3.68%              
Unsecured long-term debt, noncurrent     $ 88,000,000       88,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 457,000       518,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.78% due August 2028                    
Debt Instrument [Line Items]                    
Stated percentage     3.78%              
Unsecured long-term debt, noncurrent     $ 15,000,000       15,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 80,000       91,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.93% due May 2033                    
Debt Instrument [Line Items]                    
Stated percentage     3.93%              
Unsecured long-term debt, noncurrent     $ 38,000,000       38,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 221,000       238,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.22% due May 2038                    
Debt Instrument [Line Items]                    
Stated percentage     4.22%              
Unsecured long-term debt, noncurrent     $ 45,000,000       45,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 275,000       291,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.50% due May 2048                    
Debt Instrument [Line Items]                    
Stated percentage     4.50%              
Unsecured long-term debt, noncurrent     $ 20,000,000       20,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 128,000       133,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.60% due August 2048                    
Debt Instrument [Line Items]                    
Stated percentage     4.60%              
Unsecured long-term debt, noncurrent     $ 85,000,000       85,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 550,000       570,000      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.21% due April 2030                    
Debt Instrument [Line Items]                    
Stated percentage     3.21%              
Unsecured long-term debt, noncurrent     $ 150,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 1,490,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.57% due April 2039                    
Debt Instrument [Line Items]                    
Stated percentage     3.57%              
Unsecured long-term debt, noncurrent     $ 50,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     511,000       0      
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2019 $250.0 Million Term Loan due July 2020                    
Debt Instrument [Line Items]                    
Term loans     0       250,000,000.0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       0      
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2019 $40.0 Million Term Loan due June 2021                    
Debt Instrument [Line Items]                    
Term loans     40,000,000       40,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       0      
Texas-New Mexico Power Company                    
Debt Instrument [Line Items]                    
Total     843,198,000       658,198,000      
Principal, less current maturities     0       0      
Long-term debt, excluding current maturities, gross     843,198,000       658,198,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     (10,475,000)       (12,493,000)      
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities     0       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities     $ (10,475,000)       (12,493,000)      
Texas-New Mexico Power Company | First Mortgage Bonds: | 6.95% due April 2043                    
Debt Instrument [Line Items]                    
Stated percentage     6.95%              
Unsecured long-term debt, noncurrent     $ 93,198,000       93,198,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ (15,917,000)       (16,632,000)      
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.03% due July 2024                    
Debt Instrument [Line Items]                    
Stated percentage     4.03%              
Unsecured long-term debt, noncurrent     $ 80,000,000       80,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 369,000       475,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.53% due February 2026                    
Debt Instrument [Line Items]                    
Stated percentage     3.53%              
Unsecured long-term debt, noncurrent     $ 60,000,000       60,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 420,000       502,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.22% due August 2027                    
Debt Instrument [Line Items]                    
Stated percentage     3.22%              
Unsecured long-term debt, noncurrent     $ 60,000,000       60,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 380,000       437,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.85% due June 2028                    
Debt Instrument [Line Items]                    
Stated percentage     3.85%              
Unsecured long-term debt, noncurrent     $ 60,000,000       60,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 469,000       531,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.79% due March 2034                    
Debt Instrument [Line Items]                    
Stated percentage     3.79%              
Unsecured long-term debt, noncurrent     $ 75,000,000       75,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 497,000       535,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.92% due March 2039                    
Debt Instrument [Line Items]                    
Stated percentage     3.92%              
Unsecured long-term debt, noncurrent     $ 75,000,000       75,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 514,000       542,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.06% due March 2044                    
Debt Instrument [Line Items]                    
Stated percentage     4.06%              
Unsecured long-term debt, noncurrent     $ 75,000,000       75,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 524,000       546,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.60% due July 2029                    
Debt Instrument [Line Items]                    
Stated percentage     3.60%              
Unsecured long-term debt, noncurrent     $ 80,000,000       80,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 511,000       571,000      
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.73% due April 24, 2030                    
Debt Instrument [Line Items]                    
Stated percentage     2.73%              
Unsecured long-term debt, noncurrent     $ 85,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 784,000       0      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due April 24, 2050                    
Debt Instrument [Line Items]                    
Stated percentage     3.36%              
Unsecured long-term debt, noncurrent     $ 25,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 243,000       0      
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.93% due July 15, 2035                    
Debt Instrument [Line Items]                    
Stated percentage     2.93%              
Unsecured long-term debt, noncurrent     $ 25,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 241,000       0      
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due July 15, 2050                    
Debt Instrument [Line Items]                    
Stated percentage     3.36%              
Unsecured long-term debt, noncurrent     $ 50,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     490,000       0      
PNMR                    
Debt Instrument [Line Items]                    
Total     745,000,000       590,000,000      
Principal, less current maturities     230,000,000       140,000,000      
Long-term debt, excluding current maturities, gross     515,000,000       450,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     143,000       994,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities     52,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities     91,000       994,000      
PNMR | PNMR 3.25% 2018 SUNs due March 2021                    
Debt Instrument [Line Items]                    
Term loans     $ 300,000,000       300,000,000      
Stated percentage     3.25%              
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 137,000       917,000      
PNMR | PNMR Development Term Loan due January 2022                    
Debt Instrument [Line Items]                    
Term loans     65,000,000       90,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       42,000      
PNMR | PNMR 2018 Two-Year Term Loan due December 2020                    
Debt Instrument [Line Items]                    
Term loans     0       50,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       0      
PNMR | PNMR 2019 Term Loan due June 2021                    
Debt Instrument [Line Items]                    
Term loans     150,000,000       150,000,000      
Unamortized Discounts, (Premiums), and Issuance Costs, net     6,000       35,000      
PNMR | PNMR 2020 Term Loan due January 2022                    
Debt Instrument [Line Items]                    
Term loans     150,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     0       0      
PNMR | PNMR 2020 Delayed-Draw Term Loan due January 2022                    
Debt Instrument [Line Items]                    
Repayments of debt   $ 220,000,000.0                
Term loans     80,000,000       0      
Unamortized Discounts, (Premiums), and Issuance Costs, net     $ 0       $ 0