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Significant Financing Transactions (Tables)
 6 Months Ended
Jun. 30, 2011
Significant Financing Transactions  
Schedule of Line of Credit Facilities
     Facility
Limit		      Outstanding
Commercial
Paper		      Outstanding
Letters of
Credit		      Facility
Capacity
Available		  
(millions)                            

Three-year joint revolving credit facility(1)

   $ 3,000       $ 1,786       $ 1       $ 1,213   

Three-year joint revolving credit facility(2)

     500         —           54         446   
                                   

Total

    $ 3,500       $ 1,786       $ 55       $ 1,659   
                                   

 

(1) This credit facility was entered into in September 2010 and terminates in September 2013. This credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion of letters of credit.
(2) This credit facility was entered into in September 2010 and terminates in September 2013. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances.