Jointly-Owned Utility Plant (Ownership Information) (Details) $ in Millions	Dec. 31, 2017 USD ($) MW
Belle River facilities used jointly by Belle River and St. Clair Power plants
Jointly-Owned Utility Plant Interests [Line Items]
Ownership interest	81.00%
Belle River
Jointly-Owned Utility Plant Interests [Line Items]
Total plant capacity \| MW	1,270
Investment in Property, plant, and equipment (in millions)	$ 1,814
Accumulated depreciation (in millions)	$ 1,060
Belle River Unit 1
Jointly-Owned Utility Plant Interests [Line Items]
Ownership interest	63.00%
Belle River Unit 2
Jointly-Owned Utility Plant Interests [Line Items]
Ownership interest	75.00%
Ludington Hydroelectric Pumped Storage
Jointly-Owned Utility Plant Interests [Line Items]
Total plant capacity \| MW	2,080
Ownership interest	49.00%
Investment in Property, plant, and equipment (in millions)	$ 559
Accumulated depreciation (in millions)	$ 188

Jointly Owned Utility Plant Total Plant Capacity

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The total period end amount of plant in service and construction in progress net of accumulated depreciation for the utility's share of jointly owned electricity generation plant.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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