Inventories - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Inventory Disclosure [Line Items] | |||||
Percent of Last-in, First-out (LIFO) inventory to total inventory values | 61.00% | 61.00% | 56.00% | ||
Estimate in excess of current acquisition costs over stated inventory values | $ 1,100,000,000 | $ 1,100,000,000 | $ 1,000,000,000 | ||
Cost of sales increase/reduction, liquidations of LIFO inventories | 3,000,000 | 5,000,000 | 3,000,000 | 16,000,000 | |
Land held for residential or commercial development | $ 84,000,000 | $ 84,000,000 | $ 86,000,000 |