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Plant, Property, and Equipment (Jointly Owned Regulated Utility Facilities) (Details) (Consumers Energy Company [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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Campbell Unit 3 [Member] |
Jointly Owned Utility Plant, Proportionate Ownership Share | 93.30%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 1,059
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (430)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | 55
Jointly Owned Utility Plant, Net Ownership Amount | 684
Ludington [Member] |
Jointly Owned Utility Plant, Proportionate Ownership Share | 51.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | 175
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (118)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | 43
Jointly Owned Utility Plant, Net Ownership Amount | 100
Distribution [Member] |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | 168
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (46)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | 7
Jointly Owned Utility Plant, Net Ownership Amount | $ 129

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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