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Financial Instruments and Derivative Contracts - Fair Value of Derivative Contracts and Gains (losses) from Derivatives Contracts (Detail) (USD $)
In Millions, unless otherwise specified |
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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Sales and other operating revenues [Member]
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| Liabilities | |||
| Gains (losses) from derivatives contracts | $ 907 | $ (964) | $ 1,717 |
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Other Income [Member]
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| Liabilities | |||
| Gains (losses) from derivatives contracts | (9) | (5) | 4 |
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Purchased commodities [Member]
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| Liabilities | |||
| Gains (losses) from derivatives contracts | (729) | 915 | (1,502) |
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Income from discontinued operations [Member]
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| Liabilities | |||
| Gains (losses) from derivatives contracts | (446) | (139) | (854) |
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Commodity Contract [Member] | Prepaid expenses and other current assets [Member]
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| Assets | |||
| Commodity derivative assets | 4,433 | 3,073 | |
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Commodity Contract [Member] | Other assets [Member]
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| Assets | |||
| Commodity derivative assets | 415 | 211 | |
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Commodity Contract [Member] | Other accruals [Member]
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| Liabilities | |||
| Commodity derivative liabilities | 4,350 | 3,212 | |
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Commodity Contract [Member] | Other liabilities and deferred credits [Member]
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| Liabilities | |||
| Commodity derivative liabilities | $ 374 | $ 193 | |