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Financing - Long-term Debt (Details) - USD ($)
Jan. 18, 2019
Mar. 29, 2019
Feb. 26, 2019
Feb. 22, 2019
Dec. 31, 2018
Dec. 21, 2018
Jul. 31, 2018
May 14, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 20, 2017
Dec. 21, 2016
Dec. 17, 2015
Debt Instrument [Line Items]                          
Total         $ 2,666,345,000       $ 2,431,507,000        
Principal, less current maturities         0       257,293,000        
Long-term debt, excluding current maturities, gross         2,666,345,000       2,174,214,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         (3,765,000)       (6,138,000)        
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities         0       398,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities         (3,765,000)       (6,536,000)        
PNMR 2016 Two-Year Term Loan due December 2018                          
Debt Instrument [Line Items]                          
Long-term debt                       $ 100,000,000.0  
PNMR 2018 Two-Year Term Loan due December 2020                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 50,000,000              
Public Service Company of New Mexico                          
Debt Instrument [Line Items]                          
Total         1,665,845,000       1,665,870,000        
Principal, less current maturities         0       25,000        
Long-term debt, excluding current maturities, gross         1,665,845,000       1,665,845,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         9,355,000       7,960,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities         0       2,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities         $ 9,355,000       $ 7,958,000        
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%       1.875%        
Unsecured long-term debt, noncurrent         $ 146,000,000       $ 146,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 1,022,000       $ 1,383,000        
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%       6.25%        
Unsecured long-term debt, noncurrent         $ 36,000,000       $ 36,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 216,000       228,000        
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         $ 314,000       $ 404,000        
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%       5.20%        
Unsecured long-term debt, noncurrent         $ 40,045,000       $ 40,045,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 62,000       $ 105,000        
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%       5.90%        
Unsecured long-term debt, noncurrent         $ 255,000,000       $ 255,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 1,950,000       $ 2,040,000        
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%       6.25%        
Unsecured long-term debt, noncurrent         $ 11,500,000       $ 11,500,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 88,000       92,000        
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         $ 119,000       $ 153,000        
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%       2.40%        
Unsecured long-term debt, noncurrent         $ 39,300,000       $ 39,300,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 146,000       $ 243,000        
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%       5.20%        
Unsecured long-term debt, noncurrent         $ 21,000,000       $ 21,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 31,000       $ 53,000        
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 7.95% due May 2018                          
Debt Instrument [Line Items]                          
Stated percentage         7.95%       7.95%        
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 7.50% due August 2018                          
Debt Instrument [Line Items]                          
Stated percentage         7.50%       7.50%        
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%       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%       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: | 7.95% due May 2018                          
Debt Instrument [Line Items]                          
Stated percentage               7.95%          
Unsecured long-term debt, noncurrent         $ 0       $ 350,000,000 $ 450,000,000.0      
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       272,000        
Public Service Company of New Mexico | Senior Unsecured Notes: | 7.50% due August 2018                          
Debt Instrument [Line Items]                          
Stated percentage             7.50%            
Unsecured long-term debt, noncurrent         0       100,025,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       73,000        
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         455,000       617,000        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         338,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         666,000       0        
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         1,974,000       2,274,000        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         581,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         101,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         256,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         307,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         138,000       0        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         590,000       0        
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2017 Term Loan due January 2019                          
Debt Instrument [Line Items]                          
Long-term debt         200,000,000       200,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         1,000       23,000        
Texas-New Mexico Power Company                          
Debt Instrument [Line Items]                          
Total         560,500,000       465,500,000        
Principal, less current maturities         0       0        
Long-term debt, excluding current maturities, gross         560,500,000       465,500,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         (14,898,000)       (15,120,000)        
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities         0       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities         $ (14,898,000)       $ (15,120,000)        
Texas-New Mexico Power Company | First Mortgage Bonds: | 9.50% due April 2019                          
Debt Instrument [Line Items]                          
Stated percentage         9.50%       9.50%        
Unsecured long-term debt, noncurrent         $ 172,302,000       $ 172,302,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 206,000       $ 1,032,000        
Texas-New Mexico Power Company | First Mortgage Bonds: | 6.95% due April 2043                          
Debt Instrument [Line Items]                          
Stated percentage         6.95%       6.95%        
Unsecured long-term debt, noncurrent         $ 93,198,000       $ 93,198,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ (17,347,000)       $ (18,057,000)        
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.03% due July 2024                          
Debt Instrument [Line Items]                          
Stated percentage         4.03%       4.03%        
Unsecured long-term debt, noncurrent         $ 80,000,000       $ 80,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 580,000       $ 686,000        
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.53% due February 2026                          
Debt Instrument [Line Items]                          
Aggregate principal amount                         $ 60,000,000.0
Stated percentage         3.53%       3.53%       3.53%
Unsecured long-term debt, noncurrent         $ 60,000,000       $ 60,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 585,000       667,000        
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         $ 494,000       552,000        
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       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         584,000       0        
Texas-New Mexico Power Company | First Mortgage Bonds: | TNMP 2018 Term Loan due July 2020                          
Debt Instrument [Line Items]                          
Long-term debt         35,000,000       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       0        
PNMR                          
Debt Instrument [Line Items]                          
Total         440,000,000       300,137,000        
Principal, less current maturities         0       257,268,000        
Long-term debt, excluding current maturities, gross         440,000,000       42,869,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         1,778,000       1,022,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities         0       396,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities         1,778,000       626,000        
PNMR | PNMR 2015 Term Loan due March 2018                          
Debt Instrument [Line Items]                          
Long-term debt         0       150,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       12,000        
PNMR | BTMU Term Loan                          
Debt Instrument [Line Items]                          
Long-term debt         0       50,137,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       1,001,000        
PNMR | PNMR 2016 Two-Year Term Loan due December 2018                          
Debt Instrument [Line Items]                          
Long-term debt         0       100,000,000        
Unamortized Discounts, (Premiums), and Issuance Costs, net         0       9,000        
PNMR | PNMR 3.25% 2018 SUNs due March 2021                          
Debt Instrument [Line Items]                          
Long-term debt         300,000,000       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         1,690,000       0        
PNMR | PNMR Development Term Loan due November 2020                          
Debt Instrument [Line Items]                          
Long-term debt         90,000,000       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         88,000       0        
PNMR | PNMR 2018 Two-Year Term Loan due December 2020                          
Debt Instrument [Line Items]                          
Long-term debt         50,000,000       0        
Unamortized Discounts, (Premiums), and Issuance Costs, net         $ 0       $ 0        
Subsequent Event | PNM | PNM 2019 Term Loan                          
Debt Instrument [Line Items]                          
Aggregate principal amount $ 250,000,000.0                        
Subsequent Event | Texas-New Mexico Power Company | Mortgages | TNMP 2019 Bond Purchase Agreement                          
Debt Instrument [Line Items]                          
Aggregate principal amount   $ 225,000,000 $ 305,000,000.0                    
Stated percentage     400.00%                    
Subsequent Event | 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%                        
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    
Stated percentage         3.26%                
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Subsequent Event | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2019 Term Loan                          
Debt Instrument [Line Items]                          
Stated percentage       3.13%