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Weighted Average Actuarial Assumptions to Determine Benefit Obligations (Detail) (Domestic Pension and Other Postretirement Benefit Plans)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Domestic Pension and Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	5.40%
Expected return on plan assets	8.50%	8.50%	8.50%
Rate of compensation increase	3.10%	3.20%
Health care cost trend rate:
Assumed for next year	7.80%	8.00%
Ultimate rate	5.00%	4.50%
Year that the ultimate rate is reached	2045	2027

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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