STATEMENTS OF CAPITALIZATION (Parenthetical) (USD $)			1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2013 First Mortgage Bonds Series Due Aug. 15, 2041	Jun. 30, 2012 First Mortgage Bonds Series Due Aug. 15, 2041	Dec. 31, 2013 First Mortgage Bonds Series Due Aug. 15, 2041	Dec. 31, 2013 Unsecured Senior Notes Senior E Due Oct. 1, 2016	Dec. 31, 2013 Unsecured Senior Notes Senior G Due Dec. 1, 2018	Dec. 31, 2013 Unsecured Senior Notes Senior C and D Due Oct. 1, 2033	Dec. 31, 2013 Unsecured Senior Notes Senior F Due Oct. 1, 2036
Long-Term Debt
Debt instrument, interest rate stated percentage (in hundredths)			4.50%	4.50%	4.50%	5.60%	8.75%	6.00%	6.00%
Debt Instrument, Maturity Date			Aug. 15, 2041	Aug. 15, 2041	Aug. 15, 2041	Oct. 01, 2016	Dec. 01, 2018	Oct. 01, 2033	Oct. 01, 2036
Common Stockholder's Equity
Common stock, shares authorized (in shares)	200	200
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares outstanding (in shares)	100	100