Jointly Owned Utility Plant (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014 MW
Belle River [Member]
Jointly Owned Utility Plant Interests [Line Items]
Total plant capacity (in MW)	1,270
Investment (in millions)	$ 1,742
Accumulated depreciation (in millions)	993
Ludington Hydroelectric Pumped Storage [Member]
Jointly Owned Utility Plant Interests [Line Items]
Total plant capacity (in MW)	1,872
Ownership interest	49.00%
Investment (in millions)	412
Accumulated depreciation (in millions)	$ 175

Jointly Owned Utility Plant Total Plant Capacity

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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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