Reconciliation of Funded Status of Basic Employee Defined-Benefit Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Japanese Pension Plan
Projected benefit obligation:
Benefit obligation, beginning of year	$ 297		$ 238
Service cost	17		14		13
Interest cost	12		12		11
Actuarial (gain) loss	0		9
Benefits and expenses paid	(10)		(7)
Effect of foreign exchange rate changes	13		31
Benefit obligation, end of year	329		297		238
Plan assets:
Fair value of plan assets, beginning of year	147		114
Actual return on plan assets	(2)		1
Employer contributions	29		23
Benefits and expenses paid	(10)		(7)
Effect of foreign exchange rate changes	7		16
Fair value of plan assets, end of year	171		147		114
Funded status of the plans	(158)	[1]	(150)	[1]
Amounts recognized in accumulated other comprehensive income:
Net actuarial (gain) loss	77		71
Prior service (credit) cost	(4)		(5)
Transition obligation	1		2
Total included in accumulated other comprehensive income	74		68
Accumulated benefit obligation	295		266
U.S. Pension Plan
Projected benefit obligation:
Benefit obligation, beginning of year	454		402
Service cost	14		13		11
Interest cost	28		26		27
Actuarial (gain) loss	42		26
Benefits and expenses paid	(13)		(13)
Effect of foreign exchange rate changes	0		0
Benefit obligation, end of year	525		454		402
Plan assets:
Fair value of plan assets, beginning of year	209		169
Actual return on plan assets	0		25
Employer contributions	28		28
Benefits and expenses paid	(13)		(13)
Effect of foreign exchange rate changes	0		0
Fair value of plan assets, end of year	224		209		169
Funded status of the plans	(301)	[1]	(245)	[1]
Amounts recognized in accumulated other comprehensive income:
Net actuarial (gain) loss	151		100
Prior service (credit) cost	1		1
Transition obligation	0		0
Total included in accumulated other comprehensive income	152		101
Accumulated benefit obligation	448		390
Other Postretirement Benefit Plans, Defined Benefit
Projected benefit obligation:
Benefit obligation, beginning of year	67		53
Service cost	4		3		3
Interest cost	3		3		3
Actuarial (gain) loss	10		9
Benefits and expenses paid	(1)		(1)
Effect of foreign exchange rate changes	0		0
Benefit obligation, end of year	83		67		53
Plan assets:
Fair value of plan assets, beginning of year	0		0
Actual return on plan assets	0		0
Employer contributions	1		1
Benefits and expenses paid	(1)		(1)
Effect of foreign exchange rate changes	0		0
Fair value of plan assets, end of year	0		0		0
Funded status of the plans	(83)	[1]	(67)	[1]
Amounts recognized in accumulated other comprehensive income:
Net actuarial (gain) loss	30		21
Prior service (credit) cost	0		0
Transition obligation	0		0
Total included in accumulated other comprehensive income	$ 30		$ 21

[1] Recognized in other liabilities in the consolidated balance sheets