Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 18	$ (43)
Discrete tax benefits	46
Cash taxes paid, net of refunds	86	19	179		45
Tax contingencies, gross unrecognized tax benefits	314		314	294
Tax examination, additional tax expense including interest and penalties				1,500
Description of the status of the tax examination				We are under examination, or may be subject to examination, by the Internal Revenue Service ("IRS") for the calendar year 2005 or thereafter.
FRANCE
Income Taxes [Line Items]
Tax examination, additional tax expense including interest and penalties	$ 250		$ 250

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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