Cash Flow Hedges Derivative Instruments At Fair Value, Unwound And Settled

No definition available.

Name:	pnm_CashFlowHedgesDerivativeInstrumentsAtFairValueUnwoundAndSettled
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cash Flow Hedges Derivative Instruments, Matured

+ References

No definition available.

+ Details

Name:	pnm_CashFlowHedgesDerivativeInstrumentsMatured
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of all asset derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

+ Details

Name:	us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480463/815-10-45-5

+ Details

Name:	us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=pnm_OtherDeferredCostsNetIncludingDeferredFinanceCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing - Financing Activities - Interest Rate Hedging Activities (Narrative) (Details) - USD ($)	Dec. 31, 2024	Nov. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedges derivative instruments, unwound and settled		$ 300,000,000
Cash flow hedge derivative instruments matured	$ 600,000,000
Cash flow hedge derivative instruments at fair value	$ 0
Other Current Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedge derivative instrument assets at fair value			$ 7,200,000
Other Deferred Costs Net Including Deferred Finance Costs
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedge derivative instrument assets at fair value			$ 2,300,000