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Fair Value of Derivative and Other Financial Instruments - Defined Benefit Plans Disclosure (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year $ 2,156  
Fair value of plan assets at end of year 0 $ 2,156
Significant Unobservable Inputs (Level 3) | Mutual Fund    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year   0
Actual return on assets sold during the period (84) (38)
Actual return on assets still held at period end 56 (107)
Purchases 3,110 5,539
Sales (5,238) (3,238)
Public Service Company of New Mexico | Pension Plan    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 489,978 562,016
Fair value of plan assets at end of year 531,467 489,978
Public Service Company of New Mexico | Pension Plan | Participation in PNMR Master Trust Investments: | Fair Value Measurement [Domain]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 412,790  
Fair value of plan assets at end of year 445,984 412,790
Public Service Company of New Mexico | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 489,664  
Fair value of plan assets at end of year 532,659 489,664
Public Service Company of New Mexico | Pension Plan | Participation in PNMR Master Trust Investments: | Estimate of Fair Value Measurement    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 76,874  
Fair value of plan assets at end of year 86,675 76,874
Public Service Company of New Mexico | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 86,749 69,703
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 69,703 80,356
Fair value of plan assets at end of year 86,400 69,703
Public Service Company of New Mexico | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 190  
Fair value of plan assets at end of year 1,022 190
Public Service Company of New Mexico | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 69,513  
Fair value of plan assets at end of year 85,727 69,513
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, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 139,673  
Fair value of plan assets at end of year 152,158 139,673
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]    
Total fair value of plan assets owned 40,383 32,515
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, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 190  
Fair value of plan assets at end of year 1,022 190
Public Service Company of New Mexico | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 32,325  
Fair value of plan assets at end of year 39,361 32,325
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 272,829  
Fair value of plan assets at end of year 293,826 272,829
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 46,366 37,188
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Public Service Company of New Mexico | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 37,188  
Fair value of plan assets at end of year 46,366 37,188
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 288 191
Fair value of plan assets at end of year 0 288
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3) | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Actual return on assets sold during the period (48) (7)
Actual return on assets still held at period end 0 (1)
Purchases 133 192
Sales (373) (87)
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3) | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 288  
Fair value of plan assets at end of year 0 288
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 0 0
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Public Service Company of New Mexico | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Texas-New Mexico Power Company | Pension Plan    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 55,074 63,499
Fair value of plan assets at end of year 59,367 55,074
Texas-New Mexico Power Company | Pension Plan | Participation in PNMR Master Trust Investments: | Fair Value Measurement [Domain]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 45,283  
Fair value of plan assets at end of year 49,353 45,283
Texas-New Mexico Power Company | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 54,661  
Fair value of plan assets at end of year 59,327 54,661
Texas-New Mexico Power Company | Pension Plan | Participation in PNMR Master Trust Investments: | Estimate of Fair Value Measurement    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 9,378  
Fair value of plan assets at end of year 9,974 9,378
Texas-New Mexico Power Company | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 10,910 8,791
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 8,744 10,002
Fair value of plan assets at end of year 10,844 8,744
Texas-New Mexico Power Company | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 66  
Fair value of plan assets at end of year 275 66
Texas-New Mexico Power Company | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 8,725  
Fair value of plan assets at end of year 10,635 8,725
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, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 15,149  
Fair value of plan assets at end of year 17,335 15,149
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 4,350 3,789
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, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 66  
Fair value of plan assets at end of year 275 66
Texas-New Mexico Power Company | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 3,723  
Fair value of plan assets at end of year 4,075 3,723
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 30,101  
Fair value of plan assets at end of year 32,018 30,101
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 6,560 5,002
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Texas-New Mexico Power Company | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 5,002  
Fair value of plan assets at end of year 6,560 5,002
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 33 21
Fair value of plan assets at end of year 0 33
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3) | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Actual return on assets sold during the period (5) (1)
Actual return on assets still held at period end 0 0
Purchases 15 23
Sales (43) (10)
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3) | Pension Plan | Participation in PNMR Master Trust Investments:    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 33  
Fair value of plan assets at end of year 0 33
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total fair value of plan assets owned 0 0
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Texas-New Mexico Power Company | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits | Mutual funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Fair Value Measurement [Domain]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 458,073  
Fair value of plan assets at end of year 495,337 458,073
PNMR    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 544,325  
Fair value of plan assets at end of year 591,986 544,325
PNMR | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 20,120  
Fair value of plan assets at end of year 19,982 20,120
PNMR | International funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 54,270  
Fair value of plan assets at end of year 68,497 54,270
PNMR | Domestic value    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 874  
Fair value of plan assets at end of year 825 874
PNMR | Domestic growth    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 143,517  
Fair value of plan assets at end of year 172,326 143,517
PNMR | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 84,459  
Fair value of plan assets at end of year 90,970 84,459
PNMR | International government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 5,721  
Fair value of plan assets at end of year 5,411 5,721
PNMR | Municipals    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 9,558  
Fair value of plan assets at end of year 6,980 9,558
PNMR | Corporate and other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 139,554  
Fair value of plan assets at end of year 130,346 139,554
PNMR | Private equity funds | Estimate of Fair Value Measurement    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 18,021  
Fair value of plan assets at end of year 15,827 18,021
PNMR | Hedge funds | Estimate of Fair Value Measurement    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 45,589  
Fair value of plan assets at end of year 47,618 45,589
PNMR | Real estate funds | Estimate of Fair Value Measurement    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 22,642  
Fair value of plan assets at end of year 33,204 22,642
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 154,822  
Fair value of plan assets at end of year 169,493 154,822
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 20,120  
Fair value of plan assets at end of year 19,982 20,120
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | International funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 54,270  
Fair value of plan assets at end of year 68,497 54,270
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic value    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic growth    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 80,482  
Fair value of plan assets at end of year 81,014 80,482
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | International government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year (50)  
Fair value of plan assets at end of year 0 (50)
PNMR | Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 302,930  
Fair value of plan assets at end of year 325,844 302,930
PNMR | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Other Observable Inputs (Level 2) | International funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Other Observable Inputs (Level 2) | Domestic value    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 874  
Fair value of plan assets at end of year 825 874
PNMR | Significant Other Observable Inputs (Level 2) | Domestic growth    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 143,517  
Fair value of plan assets at end of year 172,326 143,517
PNMR | Significant Other Observable Inputs (Level 2) | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 3,977  
Fair value of plan assets at end of year 9,956 3,977
PNMR | Significant Other Observable Inputs (Level 2) | International government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 5,721  
Fair value of plan assets at end of year 5,411 5,721
PNMR | Significant Other Observable Inputs (Level 2) | Municipals    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 9,558  
Fair value of plan assets at end of year 6,980 9,558
PNMR | Significant Other Observable Inputs (Level 2) | Corporate and other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 139,283  
Fair value of plan assets at end of year 130,346 139,283
PNMR | Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 321 212
Fair value of plan assets at end of year 0 321
PNMR | Significant Unobservable Inputs (Level 3) | Cash and cash equivalents    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | International funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | Domestic value    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | Domestic growth    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | U.S. government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Actual return on assets sold during the period (53) (8)
Actual return on assets still held at period end 0 (1)
Purchases 148 215
Sales (416) (97)
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | International government    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | Municipals    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
PNMR | Significant Unobservable Inputs (Level 3) | Corporate and other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at beginning of year 321  
Fair value of plan assets at end of year $ 0 $ 321