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Supplemental Financial Information - Other Income and Expense (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Component of Operating Other Cost and Expense [Line Items] | |||
| Total other income | $ 30 | $ 25 | $ 27 |
| Total other expense | (1) | (21) | (43) |
| Total other income (expense) | 29 | 4 | (16) |
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Gain (Loss) on Disposition of Property, Plant and Equipment [Member]
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| Component of Operating Other Cost and Expense [Line Items] | |||
| income | 1 | 8 | 8 |
| expense | (18) | ||
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Disposal Group Not Discontinued Operation Gain Loss On Disposal [Member]
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| Component of Operating Other Cost and Expense [Line Items] | |||
| income | 19 | ||
| expense | (37) | ||
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Other Nonrecurring Income And Expense Other Items [Member]
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| Component of Operating Other Cost and Expense [Line Items] | |||
| income | 10 | 17 | 19 |
| expense | $ (1) | $ (3) | $ (6) |