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Financing - Long-term Debt (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 22, 2020 | Dec. 21, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 124,000 | $ (1,107,000) |  |
Total | 3,699,043,000 | 3,294,043,000 |  |
Principal, less current maturities | 179,500,000 | 576,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 161,000 | 482,000 |  |
Long-term debt, excluding current maturities, gross | 3,519,543,000 | 2,718,043,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | (37,000) | $ (1,589,000) |  |
PNMR 2020 Delayed-Draw Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans |  |  | $ 300,000,000 |
PNMR 2020 Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans |  |  |  | $ 150,000,000
Senior Unsecured Notes: | PNMR 3.25% 2018 SUNs due March 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated percentage |  | 3.25% |  |
Public Service Company of New Mexico |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 9,735,000 | $ 9,225,000 |  |
Total | 1,890,845,000 | 1,705,845,000 |  |
Principal, less current maturities | 179,500,000 | 346,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 161,000 | 430,000 |  |
Long-term debt, excluding current maturities, gross | 1,711,345,000 | 1,359,845,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 9,574,000 | 8,795,000 |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | 0 | 146,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 301,000 |  |
Stated percentage | 1.875% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.15% due April 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 146,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 1,003,000 | 0 |  |
Stated percentage | 2.15% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 37,000,000 | 37,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 45,000 | 135,000 |  |
Stated percentage | 2.125% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 20,000,000 | 20,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 17,000 | 50,000 |  |
Stated percentage | 2.45% |  |  |
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 | $ 0 | 100,345,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 798,000 |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 0.875% due October 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | 100,345,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 697,000 | 0 |  |
Stated percentage | 0.875% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 36,000,000 | 36,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 75,000 | 226,000 |  |
Stated percentage | 1.05% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 11,500,000 | 11,500,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 24,000 | 72,000 |  |
Stated percentage | 1.20% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 130,000,000 | 130,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 535,000 | 892,000 |  |
Stated percentage | 1.10% |  |  |
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] |  |  |  |
Unsecured long-term debt, noncurrent | $ 125,000,000 | 125,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 639,000 | 894,000 |  |
Stated percentage | 1.15% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.59% due July 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated percentage | 2.59% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.14% due July 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated percentage | 3.14% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.29% due December 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated percentage | 2.29% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.97% due December 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated percentage | 2.97% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 5.35% due October 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 0 | 160,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 129,000 |  |
Stated percentage | 5.35% |  |  |
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 | $ 106,000 | 184,000 |  |
Stated percentage | 3.15% |  |  |
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 | $ 353,000 | 457,000 |  |
Stated percentage | 3.45% |  |  |
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 | $ 1,075,000 | 1,375,000 |  |
Stated percentage | 3.85% |  |  |
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 | $ 395,000 | 457,000 |  |
Stated percentage | 3.68% |  |  |
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 | $ 69,000 | 80,000 |  |
Stated percentage | 3.78% |  |  |
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 | $ 203,000 | 221,000 |  |
Stated percentage | 3.93% |  |  |
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 | $ 259,000 | 275,000 |  |
Stated percentage | 4.22% |  |  |
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 | $ 124,000 | 128,000 |  |
Stated percentage | 4.50% |  |  |
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 | $ 530,000 | 550,000 |  |
Stated percentage | 4.60% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.21% due April 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 150,000,000 | 150,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 1,331,000 | 1,490,000 |  |
Stated percentage | 3.21% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.57% due April 2039 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 50,000,000 | 50,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 482,000 | 511,000 |  |
Stated percentage | 3.57% |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.59% due July 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 80,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 443,000 | 0 |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.14% due July 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | 80,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 450,000 | 0 |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.29% due December 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | 50,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 293,000 | 0 |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.97% due December 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | 100,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 587,000 | 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 | 0 | 40,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 0 |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2021 $75.0 Million Term Loan due December 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 75,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 0 |  |
Texas-New Mexico Power Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | (9,852,000) | (10,475,000) |  |
Total | 908,198,000 | 843,198,000 |  |
Principal, less current maturities | 0 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 0 | 0 |  |
Long-term debt, excluding current maturities, gross | 908,198,000 | 843,198,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | (9,852,000) | (10,475,000) |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 6.95% due April 2043 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | 93,198,000 | 93,198,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ (15,202,000) | (15,917,000) |  |
Stated percentage | 6.95% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.03% due July 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 80,000,000 | 80,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 264,000 | 369,000 |  |
Stated percentage | 4.03% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.53% due February 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 60,000,000 | 60,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 338,000 | 420,000 |  |
Stated percentage | 3.53% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.22% due August 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 60,000,000 | 60,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 324,000 | 380,000 |  |
Stated percentage | 3.22% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.85% due June 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 60,000,000 | 60,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 406,000 | 469,000 |  |
Stated percentage | 3.85% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.79% due March 2034 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 75,000,000 | 75,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 460,000 | 497,000 |  |
Stated percentage | 3.79% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.92% due March 2039 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 75,000,000 | 75,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 486,000 | 514,000 |  |
Stated percentage | 3.92% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.06% due March 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 75,000,000 | 75,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 501,000 | 524,000 |  |
Stated percentage | 4.06% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.60% due July 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 80,000,000 | 80,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 451,000 | 511,000 |  |
Stated percentage | 3.60% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.73% due April 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 85,000,000 | 85,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 699,000 | 784,000 |  |
Stated percentage | 2.73% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due April 2050 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 25,000,000 | 25,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 235,000 | 243,000 |  |
Stated percentage | 3.36% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.93% due July 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 25,000,000 | 25,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 224,000 | 241,000 |  |
Stated percentage | 2.93% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due July 2050 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured long-term debt, noncurrent | $ 50,000,000 | 50,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 473,000 | 490,000 |  |
Stated percentage | 3.36% |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.44% due August 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | $ 65,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 489,000 | 0 |  |
Stated percentage | 2.44% |  |  |
PNMR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 241,000 | 143,000 |  |
Total | 900,000,000 | 745,000,000 |  |
Principal, less current maturities | 0 | 230,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 0 | 52,000 |  |
Long-term debt, excluding current maturities, gross | 900,000,000 | 515,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 241,000 | 91,000 |  |
PNMR | PNMR 2020 Delayed-Draw Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 0 | 80,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 0 |  |
PNMR | PNMR 2021 Delayed-Draw Term Loan due May 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 900,000,000 | 0 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 241,000 | 0 |  |
PNMR | PNMR 3.25% 2018 SUNs due March 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 0 | 300,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 137,000 |  |
Stated percentage | 3.25% |  |  |
PNMR | PNMR Development Term Loan due January 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | $ 0 | 65,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 0 |  |
PNMR | PNMR 2019 Term Loan due June 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 0 | 150,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 6,000 |  |
PNMR | PNMR 2020 Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loans | 0 | 150,000,000 |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | $ 0 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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