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Fair Value Measurements (Details 2) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Liabilities  
Long-Term Debt$ 1,454,615,000$ 1,352,977,000
TEP [Member] | Carrying Value [Member]
  
Assets  
TEP Investment in Lease Debt and Equity66,000,000105,000,000
Liabilities  
Long-Term Debt1,004,000,0001,004,000,000
Carrying Value [Member]
  
Liabilities  
Long-Term Debt1,455,000,0001,353,000,000
TEP [Member] | Fair Value [Member]
  
Assets  
TEP Investment in Lease Debt and Equity75,000,000112,000,000
Liabilities  
Long-Term Debt935,000,000866,000,000
Fair Value [Member]
  
Liabilities  
Long-Term Debt1,431,000,0001,243,000,000
TEP [Member]
  
Liabilities  
Long-Term Debt$ 1,003,615,000$ 1,003,615,000