Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Total income tax expense varied from the statutory federal income tax rate for the following reasons:

	2013			2012			2011
	(In millions)
Income before income taxes	$	741		$	768		$	704
Income tax expense at 35% statutory rate	$	260		$	269		$	246
Production tax credits	(15		)	(5		)	—
Investment tax credits	(5		)	(6		)	(6		)
Depreciation	3			3			3
AFUDC - Equity	(5		)	(4		)	(1		)
Employee Stock Ownership Plan dividends	(2		)	(3		)	(3		)
Domestic production activities deduction	(18		)	(16		)	(6		)
State and other income taxes, net of federal benefit	41			40			39
Other, net	(5		)	4			(5		)
Income tax expense	$	254		$	282		$	267
Effective income tax rate	34.3		%	36.7		%	38.0		%

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Components of income tax expense  were as follows:

	2013		2012			2011
	(In millions)
Current income tax expense (benefit)
Federal	$	123	$	267		$	15
State and other income tax	23		67			21
Total current income taxes	146		334			36
Deferred income tax expense (benefit)
Federal	68		(47		)	193
State and other income tax	40		(5		)	38
Total deferred income taxes	108		(52		)	231
Total	$	254	$	282		$	267

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Deferred tax assets (liabilities) were comprised of the following at December 31:

	2013			2012
	(In millions)
Property, plant and equipment	$	(2,807	)	$	(2,578	)
Securitized regulatory assets	(130		)	(261		)
Pension and benefits	27			73
Other comprehensive income	—			15
Other, net	12			(24		)
	$	(2,898	)	$	(2,775	)
Current deferred income tax liabilities	$	(91	)	$	(14	)
Long-term deferred income tax liabilities	(2,807		)	(2,761		)
	$	(2,898	)	$	(2,775	)
Deferred income tax assets	$	1,158		$	557
Deferred income tax liabilities	(4,056		)	(3,332		)
	$	(2,898	)	$	(2,775	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2013		2012			2011
	(In millions)
Balance at January 1	$	4	$	59		$	18
Additions for tax positions of prior years	—		—			45
Reductions for tax positions of prior years	—		(3		)	(5		)
Additions for tax positions of current year	—		—			1
Settlements	—		(52		)	—
Balance at December 31	$	4	$	4		$	59