Provision (Benefit) for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2010

Provision (Benefit) for Income Taxes (Tables) [Abstract]

Provision (benefit) for income taxes from continuing operations

	Years Ended December 31,
	2010			2009		2008
	(Millions)
Current:
Federal	$	87		$	15	$	187
State		2			13		25
Foreign		40			21		8
		129			49		220
Deferred:
Federal		(63	)		269		507
State		(104	)		42		(5	)
Foreign		12			3		11
		(155	)		314		513
Total provision (benefit)	$	(26	)	$	363	$	733

Provision for income taxes from continuing operations at federal statutory rate

	Years Ended December 31,
	2010			2009			2008
	(Millions)
Provision (benefit) at statutory rate	$	(328	)	$	334		$	802
Increases (decreases) in taxes resulting from:
State income taxes (net of federal benefit)		(70	)		35			13
Foreign operations — net		(17	)		25			(16	)
Impact of nontaxable noncontrolling interests		(58	)		(49	)		(54	)
Goodwill impairment		351			—			—
Taxes on undistributed earnings of certain foreign operations		66			—			—
Reduction of tax benefits on Medicare Part D federal subsidy		11			—			—
Other — net		19			18			(12	)
Provision (benefit) for income taxes	$	(26	)	$	363		$	733

Deferred tax liabilities and Deferred tax assets

	December 31,
	2010		2009
	(Millions)
Deferred tax liabilities:
Property, plant, and equipment	$	1,784	$	3,658
Derivatives — net		111		66
Investments		2,125		491
Other		100		108
Total deferred tax liabilities		4,120		4,323
Deferred tax assets:
Accrued liabilities		369		557
Minimum tax credits		120		62
State loss and credit carryovers		278		289
Other		70		58
Total deferred tax assets		837		966
Less valuation allowance		249		289
Net deferred tax assets		588		677
Overall net deferred tax liabilities	$	3,532	$	3,646

Reconciliation of beginning and ending amount of unrecognized tax benefits

	2010			2009
	(Millions)
Balance at beginning of period	$	89		$	79
Additions based on tax positions related to the current year		11			17
Additions for tax positions for prior years		3			4
Reductions for tax positions of prior years		(12	)		(7	)
Settlement with taxing authorities		—			(4	)
Balance at end of period	$	91		$	89