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Weighted Average Actuarial Assumptions Used to Determine the Net Periodic Benefit Cost (Detail)
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12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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U.S. Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 5.98% | 6.58% | 6.75% |
| Rate of compensation increase | 4.50% | 4.50% | 4.50% |
| Expected return on assets | 8.75% | 8.75% | 8.96% |
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U.S. Postretirement Medical Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 5.77% | 6.43% | 6.66% |
| Expected return on assets | 8.75% | 8.75% | 9.00% |
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International Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 5.36% | 5.84% | 6.17% |
| Rate of compensation increase | 3.57% | 3.62% | 3.65% |
| Expected return on assets | 7.31% | 7.25% | 7.09% |
| X | ||||||||||
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- Definition
The interest rate used to adjust for the time value of money. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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