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Severance Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and early retirement program costs | $ 36 | $ 17 | $ 14

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- Definition Severance And Retirement Costs + References No definition available. + Details
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Period Type: | duration

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- Details
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