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Financing - Short-term Debt (Details) - USD ($) | Dec. 21, 2015 | Apr. 22, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jan. 08, 2014
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Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 358,000,000 | $ 250,600,000 |
Letters of credit outstanding |  |  | $ 46,200,000 |  |
Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | $ 545,600,000 |  |  |
PNMR Term Loan Agreement [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.28% |  |
Short-term debt |  |  | $ 150,000,000 | 150,000,000 |
Notes Payable to Banks [Member] | PNMR Term Loan Agreement [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Borrowings under 12-month term loan | $ 150,000,000.0 |  |  |  |
PNM Resources [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 186,200,000 |  |  |
Consolidated invested cash |  | 1,900,000 |  |  |
PNM Resources [Member] | PNMR Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.69% |  |
PNM Resources [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 300,000,000.0 |  |
Short-term debt |  |  | 74,200,000 | 41,600,000 |
Public Service Company of New Mexico [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | 118,800,000 | 0 |
Letters of credit outstanding |  |  | $ 3,200,000 |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 298,500,000 |  |  |
Consolidated invested cash |  | 0 |  |  |
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
NMPRC approved credit facility |  |  |  |  | $ 50,000,000
Weighted-average interest rate for short-term debt |  |  | 1.58% |  |
Short-term debt |  |  | $ 50,000,000 | 0 |
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 10,000,000 |  |  |
Public Service Company of New Mexico [Member] | PNMR Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.57% |  |
Public Service Company of New Mexico [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 400,000,000.0 |  |
Short-term debt |  |  | 68,800,000 | 0 |
Texas-New Mexico Power Company [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | 15,000,000 | 59,000,000 |
Letters of credit outstanding |  |  | 100,000 |  |
Short-term debt – affiliate |  |  | 7,900,000 | 11,800,000 |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 50,900,000 |  |  |
Consolidated invested cash |  | 0 |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] | Affiliated Entity [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt – affiliate |  | $ 9,200,000 |  |  |
Texas-New Mexico Power Company [Member] | Intercompany loan agreements [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt - affiliate |  |  | $ 7,900,000 |  |
Texas-New Mexico Power Company [Member] | TNMP Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.44% |  |
Texas-New Mexico Power Company [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 75,000,000.0 |  |
Short-term debt |  |  | 15,000,000 | $ 59,000,000 |
Texas-New Mexico Power Company [Member] | Revolving Credit Facility [Member] | First Mortgage Bonds, Due 2014, Series 2009A, at 9.50% [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Collateral amount |  |  | $ 75,000,000 |  |

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