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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) Recognized (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 0 $ 0 $ 0
Interest cost 16,143 19,941 25,175
Expected return on plan assets (28,531) (29,453) (34,103)
Amortization of net loss 18,166 17,860 15,518
Amortization of prior service cost 0 (554) (965)
Net periodic benefit cost 5,778 7,794 5,625
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 23 38 53
Interest cost 1,907 2,453 3,316
Expected return on plan assets (4,167) (5,548) (5,278)
Amortization of net loss 0 348 675
Amortization of prior service cost 0 0 (397)
Net periodic benefit cost (2,237) (2,709) (1,631)
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 0
Interest cost 363 491 651
Amortization of net loss 395 403 318
Amortization of prior service cost 0 0 0
Net periodic benefit cost 758 894 969
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 0
Interest cost 1,741 2,177 2,686
Expected return on plan assets (3,181) (3,284) (3,868)
Amortization of net loss 1,247 1,258 941
Amortization of prior service cost 0 0 0
Settlement loss 746 0 0
Net periodic benefit cost 553 151 (241)
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 45 46 50
Interest cost 308 373 451
Expected return on plan assets (407) (538) (517)
Amortization of net loss (322) (323) (444)
Amortization of prior service cost 0 0 0
Net periodic benefit cost (376) (442) (460)
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 0
Interest cost 17 22 30
Amortization of net loss 33 24 15
Amortization of prior service cost 0 0 0
Net periodic benefit cost $ 50 $ 46 $ 45