Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefits Disclosure [Line Items]
Percentage of matching contributions by the Company to employee's contributions to 401(k) plan	50.00%	50.00%	50.00%
Matching 401(k) plan contributions included in acquisition and operating expenses	$ 4	$ 4	$ 4
Shares of employer-issued common stock held for plan participants by plan trustee	2
Lower Limit
Employee Benefits Disclosure [Line Items]
Health care plan, retirement age for eligibility	55
Health care plan, number of years of service for eligibility	15 years
Health care plan, retirement age and years of service combined years for eligibility	80 years
Upper Limit
Employee Benefits Disclosure [Line Items]
Health care plan, retirement age for eligibility	65
Percentage of employee's compensation eligible for Company match in 401(k) plan	6.00%
Japanese Pension Plan
Employee Benefits Disclosure [Line Items]
AA corporate bonds average duration	20
Expected amortization of actuarial losses to be recognized as expense in 2012	3
Defined benefit plan, expected contributions to the plan in 2012	22
U.S. Pension Plan
Employee Benefits Disclosure [Line Items]
AA corporate bonds average duration	17
Expected amortization of actuarial losses to be recognized as expense in 2012	9
Defined benefit plan, expected contributions to the plan in 2012	12
Other Postretirement Benefit Plans, Defined Benefit
Employee Benefits Disclosure [Line Items]
Expected amortization of actuarial losses to be recognized as expense in 2012	1
Associate Stock Bonus Plan
Employee Benefits Disclosure [Line Items]
Deferred policy acquisition costs, amount attributable to stock bonus plan	$ 35	$ 34	$ 40