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Supplemental Information On Oil And Gas Operations (Schedule Of Principal Changes In The Standardized Measure Of Discounted Future Net Cash Flows Attributable To Proved Reserves) (Details) (USD $)
In Millions, unless otherwise specified |
12 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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| Supplemental Information On Oil And Gas Operations [Abstract] | |||
| Beginning balance | $ 16,352 | $ 11,403 | $ 9,393 |
| Oil, gas and NGL sales, net of production costs | (5,794) | (4,982) | (3,915) |
| Net changes in prices and production costs | 1,875 | 7,423 | (1,672) |
| Extensions and discoveries, net of future development | 3,714 | 3,048 | 2,378 |
| Purchase of reserves, net of future development costs | 57 | 23 | 6 |
| Development costs incurred that reduced future development costs | 1,302 | 1,559 | 1,012 |
| Revisions of quantity estimates | (668) | 287 | 4,051 |
| Sales of reserves in place | (2) | (815) | (37) |
| Accretion of discount | 2,248 | 1,487 | 1,281 |
| Net change in income taxes | (929) | (2,663) | (51) |
| Other, primarily changes in timing and foreign exchange rates | (311) | (418) | (1,043) |
| Ending balance | $ 17,844 | $ 16,352 | $ 11,403 |
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- Definition
Other Primarily Changes In Timing And Foreign Exchange Rates No definition available.
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- Details
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- Definition
The increase in the net discounted value of the proved oil and gas reserves due only to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The change in the discounted value of the proved oil and gas reserves due to financial transactions where reserves (minerals in place) were sold. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This is the amount that proved oil and gas reserves increased due to extensions (increased estimates in the size of proven reserves), discoveries, additions, and improved recovery (increase in ability to extract oil and gas from existing reserves). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The increase (decrease) in the estimate of future income taxes that will be due on future pretax net cash flows relating to the enterprise's proved oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The change in the discounted value of the proved oil and gas reserves due to financial transactions where new reserves were purchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The increase (decrease) in sales and transfer prices and in production (lifting) costs related to future production. The effects of changes in prices and costs are computed before the effects of changes in quantities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The actual costs incurred during the reporting period to make it possible to extract or process proved oil and gas reserves. These costs were previously estimated and reduced the estimate of discounted future cash flows from oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Any changes made during the period to the evaluation or calculation of the estimated quantity of oil or gas in proved reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of sales or transfers of oil gas that was previously included in proved oil and gas reserves. This amount is net of production costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The balance as of the balance sheet date of the standardized measure of discounted future net cash flow relating to proved oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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