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	Mar. 31, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Benefit (provision) for income taxes	$ (73)	$ 18
Discrete tax benefits		46
Cash taxes paid, net of refunds	38	86	121	179
Tax contingencies	455		455		407
Tax examination, additional tax expense including interest and penalties	1,500
France
Income Taxes [Line Items]
Tax examination, additional tax expense including interest and penalties	$ 250