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Financing - Borrowing Arrangements Between PNMR and Its Subsidiaries and Short-term Debt (Details)	Feb. 21, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 22, 2019 USD ($)	Jul. 21, 2019 USD ($)	Feb. 22, 2019 USD ($)	Feb. 21, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 26, 2018 USD ($)	Dec. 12, 2017 USD ($)	Jan. 01, 2017 USD ($) bank
Short-term Debt [Line Items]
Financing capacity			$ 50,000,000	$ 40,000,000.0	$ 25,000,000.0	$ 24,500,000		$ 24,500,000
Short-term debt		$ 185,100,000					$ 235,900,000
Letters of credit outstanding		4,700,000
JPMorgan Chase Bank, N.A.
Short-term Debt [Line Items]
Letters of credit outstanding		30,300,000
PNMR 2018 One Year Term Loan
Short-term Debt [Line Items]
Short-term debt		0					150,000,000
PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity		300,000,000.0
Short-term debt		112,100,000					20,000,000
PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Short-term debt		0					6,000,000
Subsequent Event
Short-term Debt [Line Items]
Invested cash	$ 900,000
Subsequent Event | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	151,500,000
Subsequent Event | PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	40,000,000.0
Subsequent Event | Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	595,400,000
PNM Resources
Short-term Debt [Line Items]
Short-term debt		$ 112,100,000					170,000,000
PNM Resources | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Interest rates on outstanding borrowings		3.02%
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Subsidiary loan agreements		$ 0					100,000
Short-term debt		15,000,000					17,500,000
Letters of credit outstanding		100,000
Texas-New Mexico Power Company | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity		75,000,000.0
Short-term debt		$ 15,000,000					17,500,000
Interest rates on outstanding borrowings		2.47%
Texas-New Mexico Power Company | TNMP Revolving Credit Facility | 9.50% due April 2019
Short-term Debt [Line Items]
Aggregate principal amount of bonds		$ 75,000,000.0
Texas-New Mexico Power Company | Subsequent Event
Short-term Debt [Line Items]
Subsidiary loan agreements	0
Invested cash	0
Texas-New Mexico Power Company | Subsequent Event | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	31,800,000
Public Service Company of New Mexico
Short-term Debt [Line Items]
Subsidiary loan agreements		0					19,800,000
Short-term debt		58,000,000					42,400,000
Letters of credit outstanding		2,500,000
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Financing capacity										$ 50,000,000.0
Number of participating lenders (in banks) | bank										8
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Financing capacity									$ 40,000,000.0
Public Service Company of New Mexico | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity		400,000,000.0
Short-term debt		$ 48,000,000					32,400,000
Interest rates on outstanding borrowings		2.87%
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Interest rates on outstanding borrowings		2.84%
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Short-term debt		$ 10,000,000					$ 10,000,000
Public Service Company of New Mexico | PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Letters of credit outstanding		0
Public Service Company of New Mexico | Subsequent Event
Short-term Debt [Line Items]
Subsidiary loan agreements	0
Invested cash	0
Public Service Company of New Mexico | Subsequent Event | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	362,100,000
Public Service Company of New Mexico | Subsequent Event | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity	$ 10,000,000.0
Maximum
Short-term Debt [Line Items]
Subsidiary loan agreements		$ 100,000,000.0

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