Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of the income tax provision (benefit) for each of the periods presented below are as follows:



	Years Ended December 31,
	2013		2012			2011
	($ in millions)
Current
Federal	$	—	$	—		$	—
State	22		47			13
	22		47			13
Deferred
Federal	502		(358		)	1,044
State	24		(69		)	66
	526		(427		)	1,110

Total	$	548	$	(380	)	$	1,123

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

The effective income tax expense (benefit) differed from the computed "expected" federal income tax expense on earnings before income taxes for the following reasons:



	Years Ended December 31,
	2013		2012			2011
	($ in millions)
Income tax expense (benefit) at the federal statutory rate (35%)	$	505	$	(341	)	$	1,008
State income taxes (net of federal income tax benefit)	38		(38		)	74
Other	5		(1		)	41
Total	$	548	$	(380	)	$	1,123

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

The tax-effected temporary differences and tax loss carryforwards which comprise deferred taxes are as follows:



	Years Ended December 31,
	2013			2012
	($ in millions)
Deferred tax liabilities:
Natural gas and oil properties	$	(2,631	)	$	(1,999	)
Other property and equipment	(371		)	(436		)
Volumetric production payments	(1,216		)	(1,432		)
Contingent convertible debt	(439		)	(416		)
Deferred tax liabilities	(4,657		)	(4,283		)
Deferred tax assets:
Net operating loss carryforwards	535			711
Derivative instruments	108			172
Asset retirement obligations	153			142
Investments	130			106
Deferred stock compensation	66			47
Accrued liabilities	120			90
Noncontrolling interest liabilities	152			178
Alternative minimum tax credits	317			225
Other	40			55
Deferred tax assets	1,621			1,726
Valuation allowance	(148		)	(160		)
Net deferred tax assets	1,473			1,566
Net deferred tax assets (liabilities)	$	(3,184	)	$	(2,717	)

Reflected in accompanying balance sheets as:
Current deferred income tax asset	$	223		$	90
Non-current deferred income tax liability	(3,407		)	(2,807		)
Total	$	(3,184	)	$	(2,717	)

Summary of Operating Loss Carryforwards [Table Text Block]

The following table summarizes our federal and AMT NOLs as of December 31, 2013 and any related limitations:



	Total		Total Limitation		Annual Limitation
	($ in millions)
Federal net operating loss	$	592	$	49	$	15
AMT net operating loss	$	650	$	35	$	15

Summary of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending balances of unrecognized tax benefits is as follows:



	2013		2012		2011
	($ in millions)
Unrecognized tax benefits at beginning of period	$	599	$	369	$	34
Additions based on tax positions related to the current year	15		134		135
Additions to tax positions of prior years	30		96		200
Settlements	—		—		—
Unrecognized tax benefits at end of period	$	644	$	599	$	369