Pension and Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended	9 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2012	Jan. 31, 2012 United States Pension Plans of US Entity, Defined Benefit	Sep. 30, 2012 United States Pension Plans of US Entity, Defined Benefit	Jun. 30, 2011 Foreign Pension Plans, Defined Benefit	Sep. 30, 2011 Foreign Pension Plans, Defined Benefit
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntary contribution		$ 150	$ 48
Prior service cost, plan amendment	6
Reduction in pension benefit obligation				77
Reduction in the fair value of plan assets				(77)
Pension benefit obligations settlement loss				$ (5)	$ (5)