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Commitments, Guarantees and Contingencies - North Dakota Wind Development (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Miles
kV
DC Transmission Line from Square Butte [Member]
  
North Dakota Wind Development [Line Items]  
Transmission Line Length (Miles) 465
Transmission Line Capacity (kV) 250
Bison 1 Wind Project [Member]
  
North Dakota Wind Development [Line Items]  
Generating Unit Capacity (MW) 82
Expected Capital Cost 177
Capital Cost Spent to Date 171.5
MPUC, Current Cost Recovery, Approval Date 2009
MPUC, Rates, Approval Date July 2010
MPUC, Rates, Effective Date August 1, 2010
MPUC Updated Approval Date November 3, 2011
Bison 1 Wind Project, Phase 1 [Member]
  
North Dakota Wind Development [Line Items]  
Transmission Line Length (Miles) 22
Transmission Line Capacity (kV) 230
Project Completion Date 2010
Number of Turbines 16
Capacity of Turbines (MW) 2.3
Bison 1 Wind Project, Phase 2 [Member]
  
North Dakota Wind Development [Line Items]  
Project Completion Date January 2012
Number of Turbines 15
Capacity of Turbines (MW) 3.0
Bison 2 and 3 Wind Projects [Member]
  
North Dakota Wind Development [Line Items]  
Generating Unit Capacity (MW) 105
Project Completion Date 2012
Expected Capital Cost 160
Bison 2 Wind Project [Member]
  
North Dakota Wind Development [Line Items]  
Capital Cost Spent to Date 37.0
MPUC, Project, Approval Date September 8, 2011
NDPSC, Site Permit, Approval Date August 10, 2011
Bison 3 Wind Project [Member]
  
North Dakota Wind Development [Line Items]  
Capital Cost Spent to Date 14.7
MPUC, Project, Approval Date November 2, 2011
NDPSC, Site Permit, Approval Date October 12, 2011