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Liabilities for Dispositions and Discontinued Operations General Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Environmental Remediation Obligations [Abstract] |
Estimated 2012 Environmental Expenditures | $ 10
Estimated 2013 Environmental Expenditures | 8
Environmental Expenditures, Balance Sheet Caption | liabilities for dispositions and discontinued operations
Description of Remedial Actions | Remedial actions for these sites vary, but include on-site (and in certain cases off-site) removal or treatment of contaminated soils and sediments, recovery and treatment/remediation of groundwater, and source remediation and/or control.
Environmental Contingency, Loss Exposure in Excess of Accrual, High Estimate | $ 29
Environmental Applicability, Impact and Conclusion Disclosures | In addition, the Company is exposed to the risk of reasonably possible additional losses in excess of the established liabilities. As of December 31, 2011, this amount could range up to $29 million, allocable over several of the applicable sites, and arises from uncertainty over the availability, feasibility or effectiveness of certain remediation technologies, additional or different contamination that may be discovered, development of new or more effective environmental remediation technologies and the exercise of discretion in interpretation of applicable law and regulations by governmental agencies.
Port Angeles, Washington [Member] |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Status of Dispositions and Discontinued Operations | closed in 1997
Total SWP sites [Member] |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Status of Dispositions and Discontinued Operations | ceased operations in 1989 except for investigation and remediation activities
Total SWP sites [Member] |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Applicability and Impact of Environmental Laws | SWP owns or has liability for ten inactive former wood treating sites that are subject to the Resource Conservation and Recovery Act ("RCRA"), the Comprehensive Environmental Response, Compensation and Liability Act of 1980 and/or other similar federal or state statutes relating to the investigation and remediation of environmentally-impacted sites.

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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid in the second year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid within one year of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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- Definition The general applicability and impact of environmental laws and regulations upon the entity's business and how the existence of such laws and regulations may continue to give rise to loss contingencies for future environmental remediation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 172 -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 410 -SubTopic 30 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13328-110859 + Details
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- Definition Description of the status of the disposal group, including a component of the entity (discontinued operation), at the balance sheet date. For example, whether the sale has been completed or the business component is in process of being sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The general applicability and impact of environmental laws and regulations upon the entity's business and how the existence of such laws and regulations may continue to give rise to loss contingencies for future environmental remediation. The disclosure may include a contingency conclusion that addresses the estimated total unrecognized exposure to environmental remediation and other loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 171 -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 410 -SubTopic 30 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13319-110859 + Details
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