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Financing - Schedule of Revolving Credit Facility (Details) - Line of Credit - Revolving Credit Facility - USD ($) | 12 Months Ended
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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)

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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 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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