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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2020 USD ($) case	Jun. 30, 2019 facility
Sierra Club Et Al V. Midwest Generation LLC
Loss Contingencies
Number of facilities | facility		4
XOOM Energy Litigation
Loss Contingencies
Pending lawsuits | case	2
Lignite Contract With Texas Westmoreland Coal Co.
Loss Contingencies
Bond obligation | $	$ 99

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Number of Facilities

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- Definition

Third Party Bond Obligation

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

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