Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Reductions in interest related to taxing authority examinations	$ 4	$ 53	$ 100
Reductions in interest related to taxing authority examinations, net of tax	3	33	63
Income before income taxes, Foreign	187	178	173
State net operating loss carryforwards	17
Liability for unrecognized tax benefits	462	426
Unrecognized tax benefits, accrued interest	30	14
Deferred tax assets, reductions	13	13
Unrecognized tax benefits that would impact effective tax rate	$ 160	$ 125
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards, expiration date	2014
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards, expiration date	2033