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	$	922		$	960		$	991
Income tax expense at 35% statutory rate	$	323		$	336		$	347
Production tax credits	(68		)	(49		)	(6		)
Investment tax credits	(6		)	(6		)	(6		)
Depreciation	(4		)	(4		)	(4		)
AFUDC - Equity	(5		)	(4		)	(1		)
Employee Stock Ownership Plan dividends	(4		)	(4		)	(4		)
Domestic production activities deduction	(14		)	(14		)	(7		)
State and local income taxes, net of federal benefit	37			37			37
Enactment of Michigan Corporate Income Tax, net of federal expense	—			—			(87		)
Other, net	(5		)	(6		)	(1		)
Income tax expense	$	254		$	286		$	268
Effective income tax rate	27.5		%	29.8		%	27.0		%

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	$	74	$	190		$	27
State and other income tax	16		49			21
Total current income taxes	90		239			48
Deferred income tax expense (benefit)
Federal	122		39			318
State and other income tax	42		8			(98		)
Total deferred income taxes	164		47			220
Total income taxes from continuing operations	254		286			268
Discontinued operations	—		(29		)	(1		)
Total	$	254	$	257		$	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	$	(3,372	)	$	(3,389	)
Securitized regulatory assets	(127		)	(256		)
Alternative minimum tax credit carry-forwards	266			254
Merger basis differences	18			42
Pension and benefits	(30		)	(33		)
Other comprehensive loss	—			101
Derivative assets and liabilities	—			66
State net operating loss and credit carry-forwards	43			37
Other	(110		)	41
	(3,312		)	(3,137		)
Less valuation allowance	(37		)	(33		)
	$	(3,349	)	$	(3,170	)
Current deferred income tax assets (liabilities)	$	(28	)	$	21
Long-term deferred income tax liabilities	(3,321		)	(3,191		)
	$	(3,349	)	$	(3,170	)
Deferred income tax assets	$	1,808		$	1,038
Deferred income tax liabilities	(5,157		)	(4,208		)
	$	(3,349	)	$	(3,170	)

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	$	11		$	48		$	28
Additions for tax positions of prior years	—			—			27
Reductions for tax positions of prior years	—			(2		)	(4		)
Additions for tax positions of current year	—			1			1
Settlements	—			(30		)	(3		)
Lapse of statute of limitations	(1		)	(6		)	(1		)
Balance at December 31	$	10		$	11		$	48