Income Taxes - Net Deferred Tax Assets Presented on Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred tax assets	$ 186us-gaap_DeferredTaxAssetsNetCurrent	$ 275us-gaap_DeferredTaxAssetsNetCurrent
Current deferred tax liabilities	(21)us-gaap_DeferredTaxLiabilitiesCurrent	(9)us-gaap_DeferredTaxLiabilitiesCurrent
Long-term deferred tax assets	147us-gaap_DeferredTaxAssetsNetNoncurrent	120us-gaap_DeferredTaxAssetsNetNoncurrent
Long-term deferred tax liabilities	(172)	(200)
Net deferred tax assets	$ 140us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 186us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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