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Weighted Average Actuarial Assumptions Used to Determine the Benefit Obligations (Detail)
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Dec. 31, 2011
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Dec. 31, 2010
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U.S. Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 5.64% | 5.98% |
| Rate of compensation increase | 4.50% | 4.50% |
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U.S. Postretirement Medical Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 5.47% | 5.77% |
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International Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 4.63% | 5.36% |
| Rate of compensation increase | 3.58% | 3.57% |
| X | ||||||||||
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- Definition
The interest rate used to adjust for the time value of money for the plan. 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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| X | ||||||||||
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- Details
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