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Pension and Other Postretirement Benefits - APBO, PBO, Fair Value of Plan Assets, and Funded Status of the Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost $ 19,057 $ 58,101  
Public Service Company of New Mexico      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost 18,718 56,273  
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 630,904 605,745  
Service cost 0 0 $ 0
Interest cost 16,143 19,941 25,175
Actuarial (gain) loss (19,372) 47,567  
Benefits paid (43,614) (42,349)  
Settlements 0 0  
Balance at end of year 584,061 630,904 605,745
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 587,530 531,467  
Actual return on plan assets 32,791 98,412  
Employer contributions 0 0  
Fair value of plan assets at end of year 576,707 587,530 531,467
Funded status – asset (liability) for pension benefits (7,354) (43,374)  
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 75,196 75,121  
Service cost 23 38 53
Interest cost 1,907 2,453 3,316
Participant contributions 1,617 1,714  
Actuarial (gain) loss (5,053) 3,261  
Benefits paid (6,706) (7,391)  
Balance at end of year 66,984 75,196 75,121
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 93,402 86,400  
Actual return on plan assets 4,783 9,423  
Employer contributions 2,709 3,256  
Participant contributions 1,617 1,714  
Benefits paid (6,706) (7,391)  
Fair value of plan assets at end of year 95,805 93,402 86,400
Funded status – asset (liability) for pension benefits 28,821 18,206  
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 14,222 14,994  
Service cost 0 0 0
Interest cost 363 491 651
Actuarial (gain) loss (657) 78  
Benefits paid (1,316) (1,341)  
Balance at end of year 12,612 14,222 14,994
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Less current liability 1,248 1,323  
Accrued pension liability and postretirement benefit cost 11,364 12,899  
Texas-New Mexico Power Company      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost 339 1,828  
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 67,390 65,574  
Service cost 0 0 0
Interest cost 1,741 2,177 2,686
Actuarial (gain) loss (3,306) 4,459  
Benefits paid (3,678) (4,820)  
Settlements (2,538) 0  
Balance at end of year 59,609 67,390 65,574
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 66,149 59,367  
Actual return on plan assets 3,009 11,602  
Employer contributions 0 0  
Fair value of plan assets at end of year 62,942 66,149 59,367
Funded status – asset (liability) for pension benefits 3,333 (1,241)  
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 11,938 11,235  
Service cost 45 46 50
Interest cost 308 373 451
Participant contributions 135 243  
Actuarial (gain) loss (1,141) 747  
Benefits paid (715) (706)  
Balance at end of year 10,570 11,938 11,235
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 12,885 10,844  
Actual return on plan assets 288 2,505  
Employer contributions 0 0  
Participant contributions 135 243  
Benefits paid (715) (707)  
Fair value of plan assets at end of year 12,593 12,885 10,844
Funded status – asset (liability) for pension benefits 2,023 947  
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 678 692  
Service cost 0 0 0
Interest cost 17 22 30
Actuarial (gain) loss (211) 58  
Benefits paid (78) (94)  
Balance at end of year 406 678 $ 692
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Less current liability 67 91  
Accrued pension liability and postretirement benefit cost $ 339 $ 587