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Variable Interest Entities (Schedule Of Partnerships) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
T.E.S. Filer City [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 50.00%
Grayling [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 50.00%
Genesee [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 50.00%
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 8
Genesee [Member] | Guarantee of Indebtedness of Others [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 3