Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

The Company's long-term debt outstanding and weighted average interest rates(a) of debt outstanding at December 31 were:

	2012			2011
Taxable Debt, Principally Secured	(In millions)
5.0% due 2013 to 2042	$	3,777		$	3,515
Tax- Exempt Revenue Bonds (b)
5.3% due 2014 to 2038	707			893
	4,484			4,408
Less amount due within one year	(263		)	(303		)
	$	4,221		$	4,105
Securitization Bonds
6.6% due 2013 to 2015	$	479		$	643
Less amount due within one year	(177		)	(164		)
	$	302		$	479

Schedule of Issued Debt [Table Text Block]

In 2012, the Company issued the following long-term debt:

Month	Type	Interest Rate		Maturity	Amount
					(In millions)
June	Mortgage Bonds (a)	2.65	%	2022	$	250
June	Mortgage Bonds (a)	3.95	%	2042	250
					$	500

Schedule of Extinguishment of Debt [Table Text Block]

Month	Type	Interest Rate	Maturity	Amount
				(In millions)
March/September	Securitization Bonds	6.42%	2012	$	164
April	Mortgage Bonds	7.90%	2012	10
April	Mortgage Bonds	8.36%	2012	3
July	Senior Notes	5.20%	2012	225
December	Tax Exempt Bonds	3.05%	2024	65
December	Tax Exempt Bonds	5.45%	2032	64
December	Tax Exempt Bonds	5.25%	2032	56
				$	587

Schedule of Maturities of Long-term Debt [Table Text Block]

											2018 &
	2013		2014		2015		2016		2017		thereafter		Total
	(In millions)
Amount to mature	$	440	$	500	$	315	$	151	$	—	$	3,565	$	4,971