Income Taxes - Net Deferred Tax Assets Presented on Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Current deferred tax assets	$ 170	$ 206
Current deferred tax liabilities	(19)	(44)
Long-term deferred tax assets	90	69
Long-term deferred tax liabilities	(141)	(81)
Net deferred tax assets	$ 100	$ 150

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.

+ References+ Details

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).

+ References+ Details

- 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.

+ References+ Details

- Definition

+ References+ Details