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Financing - PNMR and Its Subsidiaries and Short-term Debt (Details) - USD ($) | Feb. 19, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 08, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |  |
Weighted average borrowing rate |  | 6.60% | 6.60% |  | 6.90%
Short-term debt |  | $ 250,600,000 | $ 105,600,000 |  |
Letters of credit outstanding |  | $ 6,200,000 |  |  |
PNMR Term Loan Agreement [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted average borrowing rate |  | 1.26% |  |  |
Short-term debt |  | $ 150,000,000 | 100,000,000 |  |
PNMR Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 300,000,000 |  |  |
Weighted average borrowing rate |  | 1.67% |  |  |
Short-term debt |  | $ 41,600,000 | 600,000 |  |
TNMP Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted average borrowing rate |  | 1.29% |  |  |
Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Invested cash | $ 1,900,000 |  |  |  |
Subsequent Event [Member] | PNMR Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Available borrowing capacity | 187,700,000 |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Available borrowing capacity | 598,200,000 |  |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate |  | $ 11,800,000 | 22,700,000 |  |
Short-term debt |  | 59,000,000 | 5,000,000 |  |
Letters of credit outstanding |  | 100,000 |  |  |
Texas-New Mexico Power Company [Member] | TNMP Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 75,000,000 |  |  |
Short-term debt |  | 59,000,000 | 5,000,000 |  |
Texas-New Mexico Power Company [Member] | TNMP Revolving Credit Facility [Member] | First Mortgage Bonds Due 2014, Series 2009A, at 9.50% [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Securities received as collateral |  | 75,000,000 |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate | 15,100,000 |  |  |  |
Invested cash | 0 |  |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] | TNMP Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Available borrowing capacity | 59,900,000 |  |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate |  | 0 | 0 |  |
Letters of credit outstanding |  | 3,200,000 |  |  |
Public Service Company of New Mexico [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 50,000,000.0 |
Public Service Company of New Mexico [Member] | PNM Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 400,000,000 |  |  |
Short-term debt |  | 0 | 0 |  |
Public Service Company of New Mexico [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  | 0 | $ 0 |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate | 0 |  |  |  |
Invested cash | 0 |  |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | PNM Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Available borrowing capacity | 350,600,000 |  |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Available borrowing capacity | $ 0 |  |  |  |
Maximum [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate |  | $ 100,000,000 |  |  |

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