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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Federal [Member]	Mar. 31, 2014 Europe [Member]	Dec. 31, 2013 Europe [Member]
Income Tax [Line Items]
Income tax expense (benefit)	$ 40	$ 12
Net tax benefits related to US taxable income	13
Expenses				2	60
Federal net operating loss			$ 5

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

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