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Fair Value of Derivative and Other Financial Instruments - Defined Benefit Plans Disclosure (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 576,707 $ 587,530 $ 531,467
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 95,805 93,402 86,400
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments: | Fair Value Measurement [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 527,873 498,907  
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 577,305 587,891  
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments: | Estimate of Fair Value Measurement      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 49,432 88,984  
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 96,127 93,710  
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 1,578 1,310  
Public Service Company of New Mexico | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 94,549 92,400  
Public Service Company of New Mexico | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 235,605 241,445  
Public Service Company of New Mexico | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 59,961 53,594  
Public Service Company of New Mexico | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 1,578 1,310  
Public Service Company of New Mexico | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 58,383 52,284  
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 292,268 257,462  
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 36,166 40,116  
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 36,166 40,116  
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 62,942 66,149 59,367
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 12,593 12,885 $ 10,844
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments: | Fair Value Measurement [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 58,623 56,966  
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 62,585 66,196  
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Participation in PNMR Master Trust Investments: | Estimate of Fair Value Measurement      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 3,962 9,230  
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 12,630 12,861  
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 381 18  
Texas-New Mexico Power Company | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 12,249 12,843  
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 21,390 28,732  
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 11,956 10,824  
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 381 18  
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 11,575 10,806  
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Pension Plan | Participation in PNMR Master Trust Investments:      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 37,233 28,234  
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 674 2,037  
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 674 2,037  
PNMR      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 639,890 $ 654,087  
PNMR | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share  
PNMR | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share  
PNMR | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share  
PNMR | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 586,496 $ 555,873  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 18,924 20,812  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Corporate stocks, common      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 92,484 114,983  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Corporate stocks, preferred      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 806 1,187  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 222,106 173,931  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 95,429 97,460  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | International government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 5,977 6,202  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Municipals      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 6,143 6,277  
PNMR | Fair Value, Inputs, Level 1, 2 and 3 | Corporate and other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 144,627 135,021  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 256,995 270,177  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 18,924 20,812  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, common      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 92,484 114,983  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, preferred      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 135  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 59,203 47,418  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 86,384 86,829  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | International government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
PNMR | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 329,501 285,696  
PNMR | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
PNMR | Significant Other Observable Inputs (Level 2) | Corporate stocks, common      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
PNMR | Significant Other Observable Inputs (Level 2) | Corporate stocks, preferred      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 806 1,052  
PNMR | Significant Other Observable Inputs (Level 2) | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 162,903 126,513  
PNMR | Significant Other Observable Inputs (Level 2) | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 9,045 10,631  
PNMR | Significant Other Observable Inputs (Level 2) | International government      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 5,977 6,202  
PNMR | Significant Other Observable Inputs (Level 2) | Municipals      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 6,143 6,277  
PNMR | Significant Other Observable Inputs (Level 2) | Corporate and other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 144,627 135,021  
PNMR | Fair Value Measured at Net Asset Value Per Share | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 10,479 12,552  
PNMR | Fair Value Measured at Net Asset Value Per Share | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 8,913 52,285  
PNMR | Fair Value Measured at Net Asset Value Per Share | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 34,002 $ 33,377