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Merger (Details) - Forecast - Merger Agreement - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |
Business combination, cash right per common share (in dollars per share) |  | $ 50.30
Out-of-pocket fees and expenses reimbursement | $ 10.0 |
PNMR |  |
Business Acquisition [Line Items] |  |
Termination fees | 130.0 |
Avangrid |  |
Business Acquisition [Line Items] |  |
Termination fees | $ 184.0 |

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- Definition Business Combination, Cash Right Per Common Share + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Out-of-pocket Fees And Expenses Reimbursement + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Termination Fees + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |