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Plant, Property, and Equipment (Jointly Owned Regulated Utility Facilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Campbell Unit 3 [Member]
 
Jointly Owned Utility Plant, Proportionate Ownership Share 93.30%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 1,080
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation (431)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 84
Jointly Owned Utility Plant, Net Ownership Amount 733
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 (147)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 87
Jointly Owned Utility Plant, Net Ownership Amount 115
Distribution [Member]
 
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service 182
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation (56)
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 5
Jointly Owned Utility Plant, Net Ownership Amount $ 131