Provision (Benefit) for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Provision (Benefit) for Income Taxes [Abstract]

Provision (benefit) for income taxes from continuing operations

				Years Ended December 31,
			2012		2011		2010
				(Millions)
Current:
	Federal		$	91	$	181	$	(21)
	State			17		13		(2)
	Foreign			40		(6)		29
				148		188		6
Deferred:
	Federal			220		(61)		144
	State			(13)		(14)		(48)
	Foreign			5		11		12
				212		(64)		108
		Total provision (benefit)	$	360	$	124	$	114

Provision for income taxes from continuing operations at federal statutory rate

			Years Ended December 31,
		2012		2011		2010
			(Millions)
Provision (benefit) at statutory rate		$	451	$	421	$	135
Increases (decreases) in taxes resulting from:
	Impact of nontaxable noncontrolling interests		(72)		(96)		(58)
	State income taxes (net of federal benefit)		2		11		(35)
	Foreign operations – net		(36)		(14)		(22)
	Federal settlements		-		(109)		-
	International revised assessments		-		(38)		-
	Taxes on undistributed earnings of certain foreign operations		-		(66)		66
	Reduction of tax benefits on Medicare Part D federal subsidy		-		-		11
	Other – net		15		15		17
Provision (benefit) for income taxes		$	360	$	124	$	114

Deferred tax liabilities and Deferred tax assets

			December 31,
			2012		2011
				(Millions)
Deferred tax liabilities:
	Property, plant, and equipment		$	72	$	65
	Investments			3,146		2,560
	Other			34		46
		Total deferred tax liabilities		3,252		2,671
Deferred tax assets:
	Accrued liabilities			313		324
	Minimum tax credits *			74		119
	State loss and credit carryovers			195		170
	Other			90		98
		Total deferred tax assets		672		711
	Less valuation allowance			144		145
		Net deferred tax assets		528		566
Overall net deferred tax liabilities			$	2,724	$	2,105

Reconciliation of beginning and ending amount of unrecognized tax benefits

	2012		2011
		(Millions)
Balance at beginning of period	$	38	$	91
Additions based on tax positions related to the current year		4		26
Additions for tax positions of prior years		22		4
Reductions for tax positions of prior years		(6)		(39)
Settlement with taxing authorities		-		(44)
Balance at end of period	$	58	$	38