Components of Retirement Expense for the Japanese and U.S. Pension Plans (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Japanese Pension Plan
Components of net periodic benefit cost:
Service cost	$ 5	$ 4	$ 13	$ 11
Interest cost	1	1	4	3
Expected return on plan assets	(1)	(1)	(3)	(2)
Amortization of net actuarial loss	0	1	2	2
Net periodic benefit cost	5	5	16	14
U.S. pension plan
Components of net periodic benefit cost:
Service cost	4	3	11	9
Interest cost	3	3	11	10
Expected return on plan assets	(4)	(4)	(11)	(10)
Amortization of net actuarial loss	2	2	5	4
Net periodic benefit cost	$ 5	$ 4	$ 16	$ 13