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Guarantees (Tables)
6 Months Ended
Jun. 30, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Guarantee Obligations Text Block
    Maximum   
    Exposure   
Subsidiary Description (in millions) Expiration Dates
         
Various Surety Bonds $ 35.0 July 2012 - Nov 2015 (1)
         
Various Letters of Credit  $ 19.5 Oct 2012 - Dec 2012
        
Various NE Hydro Companies' Long-Term Debt $ 6.6 Unspecified
         
NUSCO and RRR Lease Payments for Vehicles and Real Estate  $ 21.9 2019 and 2024
         
NU Enterprises Surety Bonds, Insurance Bonds and Performance Guarantees $ 109.4 (2) (2)