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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Payment defaults under agreements |  |  | $ 0 |  | $ 0 |
Dividends declared per common share (dollars per share) |  | $ 0.2900 | $ 0.308 | $ 0.290 | $ 0.615 | $ 0.580
Dividends declared on common stock |  |  |  | $ 132,000 | $ 24,493,000 | $ 23,099,000
Subsequent event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared per common share (dollars per share) | $ 0.3075 |  |  |  |  |
PNM |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared on common stock |  |  | $ 40,700,000 | 0 | 40,654,000 | 0
Texas-New Mexico Power Company |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared on common stock |  |  | $ 7,092,000 | $ 4,098,000 | $ 18,439,000 | $ 14,811,000

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