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Fair Value of Derivative and Other Financial Instruments - Statement of Earnings Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
PNM | Designated as Hedging Instrument | Commodity derivatives | Cost of energy
Derivative Instruments, Gain (Loss) [Line Items]
Total gain	$ 0.1	$ 0.1	$ 0.1	$ 0.1

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

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+ References

No definition available.

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