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Goodwill and Intangibles - Summary of Carrying Value of Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|
| Schedule Of Identifiable Intangible Assets Acquired As Part Of Business Combination [Line Items] | ||
| Indefinite-Lived Intangible Assets | $ 701 | $ 739 |
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Trade names and trademarks [Member]
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| Schedule Of Identifiable Intangible Assets Acquired As Part Of Business Combination [Line Items] | ||
| Indefinite-Lived Intangible Assets | 494 | 494 |
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Refinery air and operating permits [Member]
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| Schedule Of Identifiable Intangible Assets Acquired As Part Of Business Combination [Line Items] | ||
| Indefinite-Lived Intangible Assets | $ 207 | $ 245 |