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STATEMENTS OF CAPITALIZATION (Parenthetical) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Schedule of Capitalization, Long-term Debt [Line Items]    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized 3,000,000 3,000,000
Common Stock, Shares, Issued 1,972,052 1,972,052
5.20% Notes, due January 15, 2020
   
Long Term Debt    
Debt instrument, interest rate, stated percentage 5.20% 5.20%
5.70% Notes, due January 15, 2035
   
Long Term Debt    
Debt instrument, interest rate, stated percentage 5.70% 5.70%
5.368% Notes, due December 1, 2015
   
Long Term Debt    
Debt instrument, interest rate, stated percentage 5.368% 5.368%
5.90% Notes, due January 15, 2037
   
Long Term Debt    
Debt instrument, interest rate, stated percentage 5.90% 5.90%
3.86% Notes, due December 21, 2021
   
Long Term Debt    
Debt instrument, interest rate, stated percentage 3.86% 3.86%