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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
PNM | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 5,428 5,914 10,855 11,827
Expected return on plan assets (7,757) (7,299) (15,514) (14,598)
Amortization of net (gain) loss 2,662 2,645 5,323 5,291
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 333 1,260 664 2,520
PNM | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 597 676 1,194 1,352
Expected return on plan assets (1,391) (1,243) (2,782) (2,485)
Amortization of net (gain) loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (794) (567) (1,588) (1,133)
PNM | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 124 135 248 270
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 50 38 100 76
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 174 173 348 346
Texas-New Mexico Power Company | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 554 600 1,107 1,201
Expected return on plan assets (687) (675) (1,374) (1,349)
Amortization of net (gain) loss 139 109 278 219
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 6 34 11 71
Texas-New Mexico Power Company | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 6 6 11 11
Interest cost 97 107 193 213
Expected return on plan assets (128) (121) (257) (241)
Amortization of net (gain) loss (160) (190) (321) (380)
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (185) (198) (374) (397)
Texas-New Mexico Power Company | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 4 3 8 6
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) $ 4 $ 3 $ 8 $ 6