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Separation of Downstream Business - Additional Information (Detail) (USD $)
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12 Months Ended | 3 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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Dec. 31, 2011
Phillips 66 [Member]
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Dec. 31, 2010
Phillips 66 [Member]
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Dec. 31, 2009
Phillips 66 [Member]
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Apr. 30, 2012
Planned Separation of Downstream Business [Member]
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Apr. 30, 2012
Planned Separation of Downstream Business [Member]
Sourced From Senior Notes [Member]
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Apr. 30, 2012
Planned Separation of Downstream Business [Member]
Sourced From Term Loan [Member]
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Apr. 30, 2012
Planned Separation of Downstream Business [Member]
Sourced From Cash On Hand [Member]
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| Assets Held For Sale [Line Items] | ||||||||||
| Special cash distribution from Phillips 66 | $ 7,800,000,000 | $ 5,800,000,000 | $ 2,000,000,000 | $ 1,600,000,000 | ||||||
| Cash transferred to Phillips 66 at separation | 3,600,000,000 | |||||||||
| Restricted cash | 2,468,000,000 | |||||||||
| Separation costs incurred | 17,000,000 | |||||||||
| Sales and other operating revenues | 65,756,000,000 | 57,296,000,000 | 48,828,000,000 | 15,822,000,000 | 13,412,000,000 | 11,424,000,000 | ||||
| Purchased commodities | $ 29,975,000,000 | $ 24,969,000,000 | $ 21,349,000,000 | $ 516,000,000 | $ 479,000,000 | $ 606,000,000 | ||||