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Financial Instruments and Derivative Contracts - Commodity Derivative and Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|---|---|---|
| Financial Assets | |||||
| Investment in LUKOIL | $ 1,083 | [1] | |||
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Fair Value [Member] | Foreign currency exchange derivatives [Member]
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| Financial Assets | |||||
| Foreign currency exchange derivatives | 13 | 15 | |||
| Financial Liabilities | |||||
| Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 23 | 9 | |||
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Fair Value [Member] | Interest rate derivatives [Member]
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| Financial Assets | |||||
| Interest rate derivatives | 31 | 20 | |||
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Fair Value [Member] | Commodity Contract [Member]
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| Financial Assets | |||||
| Price Risk Derivative Assets, at Fair Value | 814 | 624 | |||
| Financial Liabilities | |||||
| Price Risk Derivative Liabilities, at Fair Value | 446 | 426 | |||
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Fair Value [Member] | LUKOIL Investment [Member]
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| Financial Assets | |||||
| Investment in LUKOIL at fair value | 1,083 | ||||
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Fair Value [Member] | Total debt, excluding capital leases [Member]
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| Financial Liabilities | |||||
| Total debt, excluding capital leases | 27,065 | 26,144 | |||
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Fair Value [Member] | Joint Venture Acquisition Obligation [Member]
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| Financial Liabilities | |||||
| Joint venture acquisition obligation at fair value | 4,820 | 5,600 | |||
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Carrying Amount [Member] | Foreign currency exchange derivatives [Member]
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| Financial Assets | |||||
| Foreign currency exchange derivatives | 13 | 15 | |||
| Financial Liabilities | |||||
| Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 23 | 9 | |||
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Carrying Amount [Member] | Interest rate derivatives [Member]
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| Financial Assets | |||||
| Interest rate derivatives | 31 | 20 | |||
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Carrying Amount [Member] | Commodity Contract [Member]
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| Financial Assets | |||||
| Price Risk Derivative Assets, at Fair Value | 814 | 624 | |||
| Financial Liabilities | |||||
| Price Risk Derivative Liabilities, at Fair Value | 446 | 426 | |||
|
Carrying Amount [Member] | LUKOIL Investment [Member]
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| Financial Assets | |||||
| Investment in LUKOIL | 1,083 | ||||
|
Carrying Amount [Member] | Total debt, excluding capital leases [Member]
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| Financial Liabilities | |||||
| Total debt, excluding capital leases, carrying amount | 22,592 | 23,553 | |||
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Carrying Amount [Member] | Joint Venture Acquisition Obligation [Member]
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| Financial Liabilities | |||||
| Joint venture acquisition obligation at carrying value | $ 4,314 | $ 5,009 | |||
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