Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Total unrecognized tax benefits	$ 190
Tax benefits affecting effective tax rate	50
Unrecognized tax benefit impact in the next twelve months	14
Payment of interest accrued	12
Accrued penalties related to unrecognized tax benefits	2
Tax benefit of discontinued operations		70
Tax benefit related to foreign operating losses	$ 52