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Financing - Long-term Debt (Details) - USD ($)
Apr. 01, 2019
Dec. 31, 2019
Dec. 18, 2019
Jul. 01, 2019
Mar. 29, 2019
Feb. 26, 2019
Jan. 18, 2019
Dec. 31, 2018
Dec. 21, 2018
Debt Instrument [Line Items]                  
Total   $ 3,004,043,000           $ 2,666,345,000  
Principal, less current maturities   490,345,000           0  
Long-term debt, excluding current maturities, gross   2,513,698,000           2,666,345,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   (3,674,000)           (3,765,000)  
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities   77,000           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities   (3,751,000)           (3,765,000)  
PNMR 2018 Two-Year Term Loan due December 2020                  
Debt Instrument [Line Items]                  
Aggregate principal amount                 $ 50,000,000.0
Public Service Company of New Mexico                  
Debt Instrument [Line Items]                  
Total   1,755,845,000           1,665,845,000  
Principal, less current maturities   350,345,000           0  
Long-term debt, excluding current maturities, gross   1,405,500,000           1,665,845,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   7,825,000           9,355,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities   77,000           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities   $ 7,748,000           9,355,000  
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   $ 662,000           1,022,000  
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   $ 36,000,000           36,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 205,000           216,000  
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   $ 224,000           314,000  
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   $ 40,045,000           40,045,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 17,000           62,000  
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   $ 255,000,000           255,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 1,857,000           1,950,000  
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   $ 11,500,000           11,500,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 84,000           88,000  
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   $ 85,000           119,000  
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   $ 39,300,000           39,300,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 50,000           146,000  
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   $ 21,000,000           21,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 10,000           31,000  
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.35% due October 2021                  
Debt Instrument [Line Items]                  
Stated percentage   5.35%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.15% due May 2023                  
Debt Instrument [Line Items]                  
Stated percentage   3.15%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.45% due May 2025                  
Debt Instrument [Line Items]                  
Stated percentage   3.45%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.85% due August 2025                  
Debt Instrument [Line Items]                  
Stated percentage   3.85%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.68% due May 2028                  
Debt Instrument [Line Items]                  
Stated percentage   3.68%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.78% due August 2028                  
Debt Instrument [Line Items]                  
Stated percentage   3.78%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.93% due May 2033                  
Debt Instrument [Line Items]                  
Stated percentage   3.93%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.22% due May 2038                  
Debt Instrument [Line Items]                  
Stated percentage   4.22%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.50% due May 2048                  
Debt Instrument [Line Items]                  
Stated percentage   4.50%              
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.60% due August 2048                  
Debt Instrument [Line Items]                  
Stated percentage   4.60%              
Public Service Company of New Mexico | Senior Unsecured Notes: | 5.35% due October 2021                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   $ 160,000,000           160,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   292,000           455,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.15% due May 2023                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   55,000,000           55,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   261,000           338,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.45% due May 2025                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   104,000,000           104,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   562,000           666,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.85% due August 2025                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   250,000,000           250,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   1,675,000           1,974,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.68% due May 2028                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   88,000,000           88,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   518,000           581,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.78% due August 2028                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   15,000,000           15,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   91,000           101,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.93% due May 2033                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   38,000,000           38,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   238,000           256,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.22% due May 2038                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   45,000,000           45,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   291,000           307,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.50% due May 2048                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   20,000,000           20,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   133,000           138,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.60% due August 2048                  
Debt Instrument [Line Items]                  
Unsecured long-term debt, noncurrent   85,000,000           85,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   570,000           590,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2017 Term Loan due January 2019                  
Debt Instrument [Line Items]                  
Long-term debt   0           200,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   0           1,000  
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2019 $250.0 Million Term Loan due July 2020                  
Debt Instrument [Line Items]                  
Long-term debt   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]                  
Long-term debt   40,000,000              
Texas-New Mexico Power Company                  
Debt Instrument [Line Items]                  
Total   658,198,000           560,500,000  
Principal, less current maturities   0           0  
Long-term debt, excluding current maturities, gross   658,198,000           560,500,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   (12,493,000)           (14,898,000)  
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities   0           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities   $ (12,493,000)           (14,898,000)  
Texas-New Mexico Power Company | Mortgages | TNMP 2019 Bond Purchase Agreement                  
Debt Instrument [Line Items]                  
Aggregate principal amount         $ 225,000,000.0 $ 305,000,000.0      
Stated percentage           400.00%      
Texas-New Mexico Power Company | Mortgages | 3.60% due July 2029                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 80,000,000.0          
Texas-New Mexico Power Company | Senior Unsecured Notes: | 9.50% due April 2019                  
Debt Instrument [Line Items]                  
Extinguishment of debt $ 172,300,000                
Stated percentage 9.50%                
Texas-New Mexico Power Company | First Mortgage Bonds: | 9.50% due April 2019                  
Debt Instrument [Line Items]                  
Stated percentage   9.50%              
Unsecured long-term debt, noncurrent   $ 0           172,302,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 0           206,000  
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   $ (16,632,000)           (17,347,000)  
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   $ 475,000           580,000  
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   $ 502,000           585,000  
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   $ 437,000           494,000  
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   $ 531,000           584,000  
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           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 535,000           0  
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           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 542,000           0  
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           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 546,000           0  
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           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net   571,000           0  
Texas-New Mexico Power Company | First Mortgage Bonds: | TNMP 2018 Term Loan due July 2020                  
Debt Instrument [Line Items]                  
Long-term debt   0           35,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   0           0  
PNMR                  
Debt Instrument [Line Items]                  
Total   590,000,000           440,000,000  
Principal, less current maturities   140,000,000           0  
Long-term debt, excluding current maturities, gross   450,000,000           440,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   994,000           1,778,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities   0           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities   $ 994,000           1,778,000  
PNMR | PNMR 3.25% 2018 SUNs due March 2021                  
Debt Instrument [Line Items]                  
Stated percentage   3.25%              
Long-term debt   $ 300,000,000           300,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   917,000           1,690,000  
PNMR | PNMR Development Term Loan due November 2020                  
Debt Instrument [Line Items]                  
Long-term debt   90,000,000           90,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   42,000           88,000  
PNMR | PNMR 2018 Two-Year Term Loan due December 2020                  
Debt Instrument [Line Items]                  
Long-term debt   50,000,000           50,000,000  
Unamortized Discounts, (Premiums), and Issuance Costs, net   0           0  
PNMR | PNMR 2019 Term Loan due June 2021                  
Debt Instrument [Line Items]                  
Long-term debt   150,000,000           0  
Unamortized Discounts, (Premiums), and Issuance Costs, net   $ 35,000           $ 0  
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2017 Term Loan due January 2019                  
Debt Instrument [Line Items]                  
Aggregate principal amount $ 200,000,000.0                
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2019 $250.0 Million Term Loan due July 2020                  
Debt Instrument [Line Items]                  
Stated percentage   2.45%              
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2019 $40.0 Million Term Loan due June 2021                  
Debt Instrument [Line Items]                  
Stated percentage   2.39%