Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

A reconciliation of our beginning and ending gross unrecognized tax benefits (excluding interest and penalties) for each of the years ended December 31, 2012 and 2011 is as follows (in millions):

	Year Ended December 31,
	2012			2011
Balance at beginning of period	$	41		$	33
Additions based on current year tax positions	17			8
Additions based on prior year tax positions	—			—
Reductions based on settlements with taxing authority	—			—
Reductions due to lapse in statute of limitations	(6		)	—
Balance at end of period	$	52		$	41

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The components of “Income from Continuing Operations Before Income Taxes” are as follows (in millions):

	Year Ended December 31,
	2012		2011		2010
United States	$	2,022	$	1,033	$	1,053
Foreign	33		79		73
Total Income from Continuing Operations Before Income Taxes.	$	2,055	$	1,112	$	1,126

Schedule of taxes by country [Table Text Block]

Components of the income tax provision applicable to continuing operations for federal, foreign and state taxes are as follows (in millions):

	Year Ended December 31,
	2012			2011			2010
Taxes current expense:
Federal	$	17		$	13		$	5
State	10			16			10
Foreign	9			3			4
Total	36			32			19
Taxes deferred expense:
Federal	—			(7		)	5
State	—			(1		)	—
Foreign	(6		)	21			10
Total	(6		)	13			15
Total tax provision	$	30		$	45		$	34
Effective tax rate	1.5		%	4.0		%	3.0		%

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

The difference between the statutory federal income tax rate and our effective income tax rate is summarized as follows:

	Year Ended December 31,
	2012		2011		2010
Federal income tax rate	35.0	%	35.0	%	35.0	%
Increase (decrease) as a result of:
Partnership earnings not subject to tax	(35.0	)%	(35.0	)%	(35.0	)%
Corporate subsidiary earnings subject to tax	—	%	(0.8	)%	(0.1	)%
Income tax expense attributable to corporate equity earnings	0.9	%	1.5	%	0.9	%
Income tax expense attributable to foreign corporate earnings	0.1	%	2.1	%	1.3	%
State taxes	0.5	%	1.2	%	0.9	%
Effective tax rate	1.5	%	4.0	%	3.0	%

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

Our deferred tax assets and liabilities as of December 31, 2012 and 2011 resulted from the following (in millions):

	December 31,
	2012		2011
Deferred tax assets:
Book accruals	$	2	$	—
Net Operating Loss/Tax credits	42		31
Other	18		3
Total deferred tax assets	62		34
Deferred tax liabilities:
Property, plant and equipment	303		278
Other	8		6
Total deferred tax liabilities	311		284
Net deferred tax liabilities	$	249	$	250