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Supplementary Information - Condensed Consolidating Financial Information - Additional Information (Detail)
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Dec. 31, 2011
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ConocoPhillips Company [Member]
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| Condensed Financial Statements, Captions [Line Items] | |
| Ownership percentage in subsidiaries | 100.00% |
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ConocoPhillips Australia Funding Company [Member]
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| Condensed Financial Statements, Captions [Line Items] | |
| Ownership percentage in subsidiaries | 100.00% |
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ConocoPhillips Canada Funding Company I [Member]
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| Condensed Financial Statements, Captions [Line Items] | |
| Ownership percentage in subsidiaries | 100.00% |
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ConocoPhillips Canada Funding Company II [Member]
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| Condensed Financial Statements, Captions [Line Items] | |
| Ownership percentage in subsidiaries | 100.00% |