v2.4.0.6

Suspended Wells (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of Net Changes in Suspended Exploratory Well Costs | The following table reflects the net changes in suspended exploratory well costs during 2011, 2010 and 2009:
|  | Millions of Dollars |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Beginning balance at January 1 |  | $ | 1,013 |  |  |  | 908 |  |  |  | 660 |
Additions pending the determination of proved reserves |  |  | 96 |  |  |  | 216 |  |  |  | 342 |
Reclassifications to proved properties |  |  | (72 | ) |  |  | (106 | ) |  |  | (39 | )
Sales of suspended well investment |  |  | — |  |  |  | (4 | ) |  |  | (21 | )
Charged to dry hole expense |  |  | — |  |  |  | (1 | ) |  |  | (34 | )
Ending balance at December 31 |  | $ | 1,037 |  |  |  | 1,013 |  |  |  | 908 |
Summary of Aging of Suspended Well Costs | The following table provides an aging of suspended well balances at December 31, 2011, 2010 and 2009:
|  | Millions of Dollars |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Exploratory well costs capitalized for a period of one year or less |  | $ | 115 |  |  |  | 220 |  |  |  | 319 |
Exploratory well costs capitalized for a period greater than one year |  |  | 922 |  |  |  | 793 |  |  |  | 589 |
Ending balance |  | $ | 1,037 |  |  |  | 1,013 |  |  |  | 908 |
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year |  |  | 40 |  |  |  | 40 |  |  |  | 34 |
Summary of Aging of Exploratory Well Costs that have been Capitalized for More than One Year | The following table provides a further aging of those exploratory well costs that have been capitalized for more than one year since the completion of drilling as of December 31, 2011:
|  | Millions of Dollars |
|  |  |  |  | Suspended Since |
Project |  | Total |  |  | 2008-2010 |  |  | 2005-2007 |  |  | 2001-2004 |
Aktote—Kazakhstan(2) |  | $ | 19 |  |  |  | — |  |  |  | — |  |  |  | 19 |
Alpine Satellite—Alaska(2) |  |  | 21 |  |  |  | — |  |  |  | — |  |  |  | 21 |
Browse Basin—Australia(1) |  |  | 216 |  |  |  | 216 |  |  |  | — |  |  |  | — |
Caldita/Barossa—Australia(1) |  |  | 77 |  |  |  | — |  |  |  | 77 |  |  |  | — |
Fiord West—Alaska(2) |  |  | 16 |  |  |  | 16 |  |  |  | — |  |  |  | — |
Harrison—U.K.(2) |  |  | 15 |  |  |  | — |  |  |  | 15 |  |  |  | — |
Kairan—Kazakhstan(2) |  |  | 27 |  |  |  | — |  |  |  | 14 |  |  |  | 13 |
Kalamkas—Kazakhstan(1) |  |  | 14 |  |  |  | 5 |  |  |  | 5 |  |  |  | 4 |
Kashagan—Kazakhstan(1) |  |  | 44 |  |  |  | 19 |  |  |  | 15 |  |  |  | 10 |
Malikai—Malaysia(2) |  |  | 52 |  |  |  | — |  |  |  | 40 |  |  |  | 12 |
NPR-A—Alaska(2) |  |  | 17 |  |  |  | 17 |  |  |  | — |  |  |  | — |
Petai—Malaysia(2) |  |  | 30 |  |  |  | 19 |  |  |  | 11 |  |  |  | — |
Point Thomson—Alaska(2) |  |  | 37 |  |  |  | 37 |  |  |  | — |  |  |  | — |
Rak More—Kazakhstan(1) |  |  | 22 |  |  |  | 22 |  |  |  | — |  |  |  | — |
Saleski—Canada(1) |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
Shenandoah—Lower 48(1) |  |  | 43 |  |  |  | 43 |  |  |  | — |  |  |  | — |
Sunrise 3—Australia(2) |  |  | 13 |  |  |  | 13 |  |  |  | — |  |  |  | — |
Surmont III and beyond—Canada(1) |  |  | 26 |  |  |  | 6 |  |  |  | 18 |  |  |  | 2 |
Su tu Nau—Vietnam(2) |  |  | 18 |  |  |  | 9 |  |  |  | 9 |  |  |  | — |
Thornbury—Canada(1) |  |  | 19 |  |  |  | 19 |  |  |  | — |  |  |  | — |
Tiber—Lower 48(1) |  |  | 40 |  |  |  | 40 |  |  |  | — |  |  |  | — |
Titan—Norway(2) |  |  | 11 |  |  |  | 11 |  |  |  | — |  |  |  | — |
Ubah—Malaysia(2) |  |  | 34 |  |  |  | 34 |  |  |  | — |  |  |  | — |
Uge—Nigeria(1) |  |  | 29 |  |  |  | 15 |  |  |  | 14 |  |  |  | — |
Sixteen projects of $10 million or less each(1)(2) |  |  | 68 |  |  |  | 34 |  |  |  | 32 |  |  |  | 2 |
Total of 40 projects |  | $ | 922 |  |  |  | 589 |  |  |  | 250 |  |  |  | 83 |
(1) Additional appraisal wells planned. (2) Appraisal drilling complete; costs being incurred to assess development.

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- Definition Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph b -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. + Details
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- Definition Tabular disclosure of exploratory well costs that continue to be capitalized for more than one year after the completion of drilling. Information may include a description of the projects and the activities that the enterprise has undertaken to date in order to evaluate the reserves and the projects, and the remaining activities required to classify the associated reserves as proved. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph c -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. + Details
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