Income Taxes - Reconciliation of Tax Provision (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax provision at U.S. statutory rate	$ 290	$ 216	$ 149
U.S. state and local income taxes	19	6	(19)
Net U.S. tax on repatriation of foreign earnings	5	3	25
Foreign tax rate differential	(81)	(77)	(98)
Foreign withholding tax	26	34	22
Tax/(benefit) on capital gains		(1)	334
Change in tax law	(31)
Change in asset basis	(2)	(13)	(130)
Change in uncertain tax positions	20	15	22
Tax settlements		(1)	(25)
Tax/(benefits) on asset dispositions	(7)	(41)	(51)
Change in valuation allowances	48	21	(304)
Other	(24)	(14)
Provision for income tax (benefit)	$ 263	$ 148	$ (75)