Income Taxes - Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 66	$ 51	$ 46
Additions for tax positions of the current year	2
Additions for tax positions of prior years	11	39	13
Reductions for tax positions of prior years	(2)	(7)	(3)
Settlements with tax authorities	(8)	(18)	(4)
Expiration of the statute of limitations	(2)
Foreign currency translation	(4)	1	(1)
Balance at end of year	$ 63	$ 66	$ 51