Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended			6 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2010 United States Pension Plans of US Entity, Defined Benefit	Jun. 30, 2011 Foreign Pension Plans, Defined Benefit	Dec. 31, 2012 Foreign Pension Plans, Defined Benefit	Dec. 31, 2011 Foreign Pension Plans, Defined Benefit	Dec. 31, 2010 Foreign Pension Plans, Defined Benefit	Dec. 31, 2012 Foreign Postretirement Benefit Plans, Defined Benefit	Dec. 31, 2011 Foreign Postretirement Benefit Plans, Defined Benefit	Dec. 31, 2010 Foreign Postretirement Benefit Plans, Defined Benefit
Reconciliation of benefit obligation:
Obligation at beginning of period				$ 1,931	$ 1,866		$ 325	$ 243	$ 325		$ 137	$ 132
Interest cost				85	92	100		12	13	17	5	7	7
Service cost								5	5	5	1
Actuarial (gain) loss				182	114			51	(2)		(8)	7
Benefit payments				(137)	(141)			(12)	(17)		(7)	(6)
Plan amendments	6							6
New plans								3
Settlements							(77)	(3)	(77)	(32)
Translation adjustments								4	(4)		4	(3)
Obligation at end of period				2,061	1,931	1,866		309	243	325	132	137	132
Reconciliation of fair value of plan assets:
Fair value at beginning of period		1,776	1,540	1,497	1,456		120	43	120
Actual return on plan assets				162	152			1	1
Employer contributions				212	30			12	14		7	6
Benefit payments				(137)	(141)			(12)	(17)		(7)	(6)
Settlements							(77)	(3)	(77)	(32)
Translation adjustments								1	2
Fair value at end of period		1,776	1,540	1,734	1,497	1,456		42	43	120
Funded status at end of period				$ (327)	$ (434)			$ (267)	$ (200)		$ (132)	$ (137)