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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected return on plan assets   4.00%    
Amortization of gains and losses that are outside the corridor   5 years    
Expected employer disbursements for next fiscal year   $ 3,200,000    
Expected employer disbursements by employer in year 2 through year 5   $ 11,900,000    
Maximum annual contributions per employee   75.00%    
Employer matching contribution, percent of employees' gross pay   6.00%    
Minimum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Non-matching contribution of eligible compensation based on eligible employee's age   3.00%    
Maximum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Non-matching contribution of eligible compensation based on eligible employee's age   10.00%    
Public Service Company of New Mexico        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Actuarial gains (losses) recorded as regulatory assets   $ 5,700,000    
Texas-New Mexico Power Company        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Actuarial gains (losses) recorded as regulatory assets   $ 1,000,000    
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected long-term return resulting from effect of 1% change   1.00%    
Expected long-term return resulting from effect of one-percentage point increase (as a percent)   1.00%    
Expected employer contributions to pension plans   $ 0    
Pension Plan | Minimum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Weighted average discount rate related to anticipated contributions   2.90%    
Pension Plan | Equity Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   35.00%    
Pension Plan | Fixed income        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   50.00%    
Pension Plan | Alternative Investments        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   15.00%    
Pension Plan | Public Service Company of New Mexico        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected return on plan assets   5.50% 5.90% 6.86%
Expected long-term return on assets decrease resulting in increase net periodic costs In next fiscal year   $ 5,200,000    
Rate of return for retirement plan   5.80%    
Actuarial gains (losses) recorded as regulatory assets   $ 23,632,000    
Employer contributions   $ 0 $ 0  
Pension Plan | Texas-New Mexico Power Company        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected return on plan assets   5.50% 5.90% 6.90%
Expected long-term return on assets decrease resulting in increase net periodic costs In next fiscal year   $ 600,000    
Rate of return for retirement plan   4.68%    
Actuarial gains (losses) recorded as regulatory assets   $ (3,133,000)    
Employer contributions   $ 0 $ 0  
Pension Plan | Texas-New Mexico Power Company | Equity Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   16.00%    
Pension Plan | Texas-New Mexico Power Company | Fixed income        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   70.00%    
Pension Plan | Texas-New Mexico Power Company | Alternative Investments        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   14.00%    
Other Postretirement Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected long-term return resulting from effect of 1% change   1.00%    
Other Postretirement Benefits | Equity Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   30.00%    
Other Postretirement Benefits | Fixed income        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   70.00%    
Other Postretirement Benefits | Public Service Company of New Mexico        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected return on plan assets   4.75% 7.00% 7.20%
Expected long-term return on assets decrease resulting in increase net periodic costs In next fiscal year   $ 900,000    
Expected long-term return resulting from effect of one-percentage point increase (as a percent)   5.20%    
Employer matching contribution, maximum 5.00%      
Employer contributions   $ 2,709,000 $ 3,256,000  
Other Postretirement Benefits | Texas-New Mexico Power Company        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected return on plan assets   3.80% 5.60% 5.80%
Expected long-term return on assets decrease resulting in increase net periodic costs In next fiscal year   $ 100,000    
Expected long-term return resulting from effect of one-percentage point increase (as a percent)   2.30%    
Effect of 1%-point change in assumed health care cost trend rates on net periodic expense and APBO   $ 0    
Employer contributions   0 $ 0  
Other Postretirement Benefits | PNM and TNMP        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Employer contributions   0 0  
Expected employer contributions in fiscal year through year 5   0 0  
Executive Retirement Program | Public Service Company of New Mexico        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Actuarial gains (losses) recorded as regulatory assets   657,000    
Expected disbursements by employer   1,300,000 1,400,000  
Executive Retirement Program | Texas-New Mexico Power Company        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Actuarial gains (losses) recorded as regulatory assets   211,000    
Expected disbursements by employer   $ 100,000 $ 100,000  
Non-US | Pension Plan | Equity Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment allocation targets   13.00%