Jointly-Owned Utility Plant (Details) $ in Millions	Dec. 31, 2015 USD ($) MW
Belle River
Jointly-Owned Utility Plant Interests [Line Items]
Total plant capacity \| MW	1,270
Investment in Property, plant, and equipment (in millions)	$ 1,779
Accumulated depreciation (in millions)	$ 1,053
Ludington Hydroelectric Pumped Storage
Jointly-Owned Utility Plant Interests [Line Items]
Total plant capacity \| MW	1,955
Ownership interest	49.00%
Investment in Property, plant, and equipment (in millions)	$ 443
Accumulated depreciation (in millions)	$ 154

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C

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- Definition

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

+ References

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- Definition

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

+ References

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