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Commitments and Contingencies (Details) - Westmoreland - NSP-Minnesota $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Gain (Loss) Related to Litigation Settlement	$ 36
Public Utilities, General Disclosures [Line Items]
Gain (Loss) Related to Litigation Settlement	$ 36

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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