Jointly Owned Utility Plant (Detail Textuals)	Dec. 31, 2013 facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant Number of Plants	2
Belle River Unit 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	63.00%
Belle River Facilities used jointly by Belle River and St. Clair Power Plants [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	81.00%
Belle River [Member]
Jointly Owned Utility Plant Interests [Line Items]
Joint Owners Percentage of the Total Capacity Energy and Related Responsibilities	19.00%
Belle River Unit 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	75.00%
Ludington [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	49.00%
Joint Owners Percentage of the Total Capacity Energy and Related Responsibilities	51.00%