Schedule of Supplemental Cash Flow Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flow Supplemental Disclosures [Line Items]
Interest paid, including on assumed debt	$ 4	$ 23
Income taxes paid from continuing operations	12	11
Treasury stock purchases settled after the balance sheet date	25
Liabilities assumed in acquisition of business		$ 1,186