Components of Retirement Expense for the Japanese and U.S. Pension Plans (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Japanese Pension Plan
Components of net periodic benefit cost:
Service cost	$ 4	$ 4	$ 8	$ 7
Interest cost	2	1	3	2
Expected return on plan assets	(1)	0	(2)	(1)
Amortization of net actuarial loss	1	0	2	1
Net periodic benefit cost	6	5	11	9
U.S. Pension Plan
Components of net periodic benefit cost:
Service cost	3	3	7	6
Interest cost	4	4	8	7
Expected return on plan assets	(3)	(3)	(7)	(6)
Amortization of net actuarial loss	2	1	3	2
Net periodic benefit cost	$ 6	$ 5	$ 11	$ 9