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Financing - Schedule of Revolving Credit Facility (Details) - Line of Credit - Revolving Credit Facility - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Borrowings	$ 2,379,100,000	$ 1,783,400,000	$ 1,239,600,000
Repayments	(2,349,200,000)	(1,614,100,000)	(1,208,900,000)
TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Borrowings	407,600,000	480,500,000	233,400,000
Repayments	(389,200,000)	(444,200,000)	(233,000,000)
PNMR
Short-term Debt [Line Items]
Borrowings	837,200,000	612,000,000	749,600,000
Repayments	(777,300,000)	(657,500,000)	(716,700,000)
PNMR | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Borrowings	837,200,000	612,000,000	719,600,000
Repayments	(777,300,000)	(657,500,000)	(676,700,000)
PNMR | PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Borrowings	0	0	30,000,000
Repayments	0	0	(40,000,000)
PNM
Short-term Debt [Line Items]
Borrowings	1,134,300,000	690,900,000	256,600,000
Repayments	(1,182,700,000)	(512,400,000)	(259,200,000)
PNM | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Borrowings	1,064,300,000	604,000,000	216,600,000
Repayments	(1,102,700,000)	(472,400,000)	(209,200,000)
PNM | PNM New Mexico Credit Facility
Short-term Debt [Line Items]
Borrowings	70,000,000	86,900,000	40,000,000
Repayments	$ (80,000,000)	$ (40,000,000)	$ (50,000,000)

X

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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- Definition

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