Income Taxes - Components of Deferred Tax Liabilities and Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax liabilities
Property, plant and equipment and investments	$ (5,361)	$ (5,581)
Other	(269)us-gaap_DeferredTaxLiabilitiesOther	(155)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(5,630)us-gaap_DeferredTaxLiabilities	(5,736)us-gaap_DeferredTaxLiabilities
Deferred tax assets
Net operating loss carryforwards	3,010	2,726
Tax credit carryforwards	193	161
Property, plant and equipment and investments	2,245	2,643
Accrued compensation, deferred credits and other liabilities	449	982
Asset retirement obligations	1,421	1,516
Other	261us-gaap_DeferredTaxAssetsOther	216us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	7,579us-gaap_DeferredTaxAssetsGross	8,244us-gaap_DeferredTaxAssetsGross
Valuation allowances	(1,416)	(1,519)
Total deferred tax assets, net of valuation allowances	6,163us-gaap_DeferredTaxAssetsNet	6,725us-gaap_DeferredTaxAssetsNet
Net deferred tax assets	$ 533us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 989us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets property plant and equipment and investments.

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Deferred tax liabilities property plant and equipment and investments.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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