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Financing - Short-term Debt and Liquidity (Details) |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2022 USD ($) extension_option | Dec. 31, 2017 USD ($) derivative | Apr. 21, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 10, 2022 USD ($) | Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 23, 2021
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  | $ 40,000,000 |  |
Letters of credit outstanding |  |  |  | $ 3,400,000 |  |  |  |
Notes payable, related parties |  |  |  | $ 6,300,000 |  |  | $ 6,400,000 |
Variable Rate Short-Term Debt |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Term of derivatives |  | 4 years |  |  |  |  |  |
Aggregate principal amount |  | $ 50,000,000 |  |  |  |  |  |
PNM Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 1.70% |  |  |  |
PNMR Revolving Credit Facility | WEB LOC Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 30,300,000 |  |  |  |
PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |  |
Notes payable, related parties |  |  |  | 0 |  |  | 0 |
PNM | Lines of credit |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
NMPRC approved credit facility |  |  |  | 40,000,000 |  |  |  |
PNM | Senior Unsecured Notes PCRB, Reprice Date of June 2022 | Senior Unsecured Notes, Pollution Control Revenue Bonds |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  |  |  | 104,500,000 |  |  |  |
PNM | PNM 2017 New Mexico Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |  |
TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |  |
Notes payable, related parties |  |  |  | $ 700,000 |  |  | 0 |
TNMP | TNMP Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 1.25% |  |  |  |
PNMR Development |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable, related parties |  |  |  | $ 0 |  |  | $ 0 |
PNMR Development | PNMR Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 1.95% |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 300,000,000 |  |  |  |
Revolving credit facility | PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  | 400,000,000 |  |  |  |
Revolving credit facility | TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity | $ 100,000,000 |  |  |  | $ 75,000,000 |  |  |
Revolving credit facility | TNMP | First mortgage bonds |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Collateral amount |  |  |  | $ 75,000,000 |  |  |  |
Number of extension options | extension_option | 2 |  |  |  |  |  |  |
Extension option period | 1 year |  |  |  |  |  |  |
Interest rate contract |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Number of derivatives | derivative |  | 3 |  |  |  |  |  |
Interest rate 1 | Variable Rate Short-Term Debt |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  | 1.926% |  |  |  |  |  | 1.926%
Interest rate 2 | Variable Rate Short-Term Debt |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  | 1.823% |  |  |  |  |  |
Interest rate 3 | Variable Rate Short-Term Debt |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  | 1.629% |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable, related parties |  |  | $ 6,300,000 |  |  |  |  |
Remaining borrowing capacity |  |  | 705,500,000 |  |  |  |  |
Subsequent event | PNMR |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | 265,500,000 |  |  |  |  |
Consolidated invested cash |  |  | 900,000 |  |  |  |  |
Subsequent event | PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable, related parties |  |  | 0 |  |  |  |  |
Remaining borrowing capacity |  |  | 400,000,000 |  |  |  |  |
Consolidated invested cash |  |  | 8,700,000 |  |  |  |  |
Subsequent event | PNM | Lines of credit |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | 40,000,000 |  |  |  |  |
Subsequent event | TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable, related parties |  |  | 0 |  |  |  |  |
Remaining borrowing capacity |  |  | 0 |  |  |  |  |
Consolidated invested cash |  |  | 0 |  |  |  |  |
Subsequent event | PNMR Development |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable, related parties |  |  | $ 30,200,000 |  |  |  |  |

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