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Separation of Downstream Business (Details Textual) (USD $)
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3 Months Ended | 9 Months Ended | ||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Sales and Other Operating Revenues | ||||||||
| Special cash distribution from Phillips 66 | $ 7,818,000,000 | $ 0 | ||||||
| Sales and other operating revenues | 14,520,000,000 | 16,506,000,000 | 43,492,000,000 | 49,462,000,000 | ||||
| Purchased commodities | 6,436,000,000 | 7,976,000,000 | 18,314,000,000 | 22,615,000,000 | ||||
| Separation of Downstream Business (Textual) [Abstract] | ||||||||
| Restricted cash | 2,468,000,000 | 2,468,000,000 | 0 | [1] | ||||
| Cash transferred to Phillips 66 at separation | 3,600,000,000 | |||||||
| Separation costs incurred | 70,000,000 | 0 | ||||||
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Sourced from senior notes [Member]
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| Sales and Other Operating Revenues | ||||||||
| Special cash distribution from Phillips 66 | 5,800,000,000 | |||||||
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Sourced from term loan [Member]
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| Sales and Other Operating Revenues | ||||||||
| Special cash distribution from Phillips 66 | 2,000,000,000 | |||||||
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Sourced from cash on hand [Member]
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| Sales and Other Operating Revenues | ||||||||
| Special cash distribution from Phillips 66 | 1,600,000,000 | |||||||
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Phillips 66 [Member]
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| Sales and Other Operating Revenues | ||||||||
| Sales and other operating revenues | 4,012,000,000 | 4,973,000,000 | 11,611,000,000 | |||||
| Purchased commodities | $ 129,000,000 | $ 166,000,000 | $ 393,000,000 | |||||
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