Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013 and 2012 is as follows (in millions):

	Year Ended December 31,
	2013			2012
Balance at beginning of period	$	52		$	41
Additions based on current year tax positions	7			17
Additions based on prior year tax positions	—			—
Reductions based on settlements with taxing authority	(2		)	—
Reductions due to lapse in statute of limitations	—			(6		)
Balance at end of period	$	57		$	52

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,
	2013		2012		2011
U.S.	$	3,147	$	2,076	$	1,033
Foreign	338		33		79
Total Income from Continuing Operations Before Income Taxes.	$	3,485	$	2,109	$	1,112

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,
	2013			2012			2011
Taxes current expense:
Federal	$	100		$	31		$	13
State	26			10			16
Foreign	5			9			3
Total	131			50			32
Taxes deferred expense:
Federal	5			—			(7		)
State	1			—			(1		)
Foreign	27			(11		)	21
Total	33			(11		)	13
Total tax provision	$	164		$	39		$	45
Effective tax rate	4.7		%	1.8		%	4.0		%

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,
	2013		2012		2011
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	0.2	%	0.3	%	(0.8	)%
Income tax expense attributable to corporate equity earnings	0.6	%	0.9	%	1.5	%
Income tax expense attributable to foreign corporate earnings	0.8	%	0.1	%	2.1	%
Tax effect of Express pipeline system sale	2.4	%	—	%	—	%
State taxes	0.7	%	0.5	%	1.2	%
Effective tax rate	4.7	%	1.8	%	4.0	%

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

Our deferred tax assets and liabilities as of December 31, 2013 and 2012 resulted from the following (in millions):

	December 31,
	2013			2012
Deferred tax assets:
Book accruals	$	1		$	2
Net Operating Loss/Tax credits	42			42
Other	21			18
Total deferred tax assets	64			62
Deferred tax liabilities:
Property, plant and equipment	325			303
Other	11			8
Total deferred tax liabilities	336			311
Net deferred tax liabilities	$	272		$	249
Current deferred tax (asset) liability	(13		)	—
Non-current deferred tax liability	285			249
Net deferred tax liabilities	$	272		$	249