Joint Ventures and Other Equity Method Affiliates - Summarized Financial Information for Affiliates (Excluding AZLP) (Detail) (Other [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other [Member]
Equity Income from Affiliates [Line Items]
Sales	$ 1,295	$ 1,331	$ 1,486
Materials and production costs	573	584	598
Other expense, net	705	642	776
Income before taxes	17	105	112
Current assets	971	614
Noncurrent assets	112	75
Current liabilities	480	478
Noncurrent liabilities	$ 97	$ 140