v2.4.0.6

Supplemental Information On Oil And Gas Operations (Proved Undeveloped Reserves) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
U.S. Onshore [Member] |  |
Reserve Quantities [Line Items] |  |
Proved undeveloped reserves | 403 | 411
Proved Undeveloped Reserves, Extensions and discoveries | 118 |
Proved Undeveloped Reserves, Revisions due to prices | (2) |
Proved Undeveloped Reserves, Revisions other than price | (56) |
Proved Undeveloped Reserves, Conversion to proved developed reserves | (68) |
Canada [Member] |  |
Reserve Quantities [Line Items] |  |
Proved undeveloped reserves | 379 | 420
Proved Undeveloped Reserves, Extensions and discoveries | 30 |
Proved Undeveloped Reserves, Revisions due to prices | (14) |
Proved Undeveloped Reserves, Revisions other than price | 5 |
Proved Undeveloped Reserves, Conversion to proved developed reserves | (62) |
North America [Member] |  |
Reserve Quantities [Line Items] |  |
Proved undeveloped reserves | 782 | 831
Proved Undeveloped Reserves, Extensions and discoveries | 148 |
Proved Undeveloped Reserves, Revisions due to prices | (16) |
Proved Undeveloped Reserves, Revisions other than price | (51) |
Proved Undeveloped Reserves, Conversion to proved developed reserves | (130) |

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=6949603&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 10 -Paragraph a -Subparagraph 2 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e61831-109447 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e61831-109447 + Details
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