Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Benefit (provision) for income taxes	$ (94)	$ (13)	$ (167)	$ 6
Discrete tax benefits (provision)			(91)	51
Cash taxes paid, net of refunds	71	34	109	120	158	193
Tax contingencies	590		590		590		407
Tax examination, proposed additional tax expense including interest and penalties			1,500
France
Income Taxes [Line Items]
Tax examination, proposed additional tax expense including interest and penalties			$ 250