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v3.19.3.a.u2

Label | Element | Value
--- | --- | ---
Retained Earnings [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | $ 644,736,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 615,124,000
Retained Earnings [Member] | Public Service Company of New Mexico [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 265,557,000
Noncontrolling Interest [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 68,920,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 66,195,000
Noncontrolling Interest [Member] | Public Service Company of New Mexico [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 66,195,000
Parent [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption | 10,382,000
Cumulative Effect of New Accounting Principle in Period of Adoption | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 1,686,334,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 1,695,253,000
Parent [Member] | Public Service Company of New Mexico [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 1,422,174,000
Common Stock [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 1,163,661,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | 1,157,665,000
Common Stock [Member] | Public Service Company of New Mexico [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 | $ 1,264,918,000

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |