Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 87	$ 281	$ 207
Restructuring and other charges, after-tax and noncontrolling interests	73	181	130
Environmental Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		18
Restructuring and other charges, after-tax and noncontrolling interests			14
Asset Retirement Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		17
Restructuring and other charges, after-tax and noncontrolling interests			$ 30