Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Apr. 30, 2011 Pittsburgh Glass Works LLC
Schedule of Cash Flow, Supplemental [Line Items]
Cash payments for interest	$ 114	$ 112
Cash payments for income taxes	225	171
Total receipts from Pittsburgh Glass Works ("PGW")			168
Proceeds from notes receivable		90	90
Return of capital, equity affiliate			$ 78