Supplementary Information - Allowance for Doubtful Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Balance at beginning of year	$ 202	$ 177	$ 185
Provision	205	37	37
Amounts written off	(23)	(10)	(45)
Divestiture of business		(2)
Balance at end of year	$ 384	$ 202	$ 177