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Litigation And Other Contingencies (Narrative) (Details) (USD $)
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Dec. 31, 2011
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Dec. 23, 2011
days
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Jun. 30, 2011
gal
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May 01, 2007
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Dec. 31, 2011
Equity Company Obligations [Member]
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Jun. 27, 2007
Expropriation Of Assets [Member]
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Jun. 30, 2011
Compensatory Damages [Member]
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Jun. 30, 2011
Punitive Damages [Member]
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Feb. 13, 2012
Mobil Cerro Negro, Ltd. (MCN) [Member]
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Dec. 23, 2011
Mobil Cerro Negro, Ltd. (MCN) [Member]
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Oct. 24, 2011
Production Sharing Contract (PSC) [Member]
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Feb. 01, 2012
Settlement Of Litigation [Member]
Mobil Cerro Negro, Ltd. (MCN) [Member]
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Oct. 24, 2011
Pending Or Threatened Litigation [Member]
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| Loss Contingencies [Line Items] | ||||||||||||||||
| Accidental gasoline leak (gallons) | 26,000 | |||||||||||||||
| Litigation court verdict | $ 497,000,000 | $ 1,000,000,000 | ||||||||||||||
| Guarantees | 8,456,000,000 | 4,607,000,000 | [1] | |||||||||||||
| Percentage ownership interest in Cerro Negro Project | 41.67% | 41.67% | ||||||||||||||
| Net book investment in Cerro Negro Project | 750,000,000 | |||||||||||||||
| Amount awarded for contractual obligations, before deductions | 908,000,000 | |||||||||||||||
| Amount arbitration award reduced by due to debt owed to PDVSA and PdVSA CN | 161,000,000 | |||||||||||||||
| Arbitration awarded for contractual obligations after debt deducted | 747,000,000 | |||||||||||||||
| Number of days to comply with arbitration verdict | 60 | |||||||||||||||
| Partial payment of arbitration awarded for breach of contractual obligations | 305,000,000 | |||||||||||||||
| Cancellation of bond debt | 195,000,000 | |||||||||||||||
| Percent interest in Erha block PSC | 56.25% | |||||||||||||||
| Amount of award relating to excess lifting of crude oil | 1,800,000,000 | |||||||||||||||
| Accrued interest relating to award for excess lifting of crude oil | $ 234,000,000 | |||||||||||||||
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