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Liabilities for Dispositions and Discontinued Operations Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Environmental Remediation Obligations [Abstract] |
Environmental Applicability, Impact and Conclusion Disclosures | The Company is exposed to the risk of reasonably possible additional losses in excess of the established liabilities. As of March 31, 2012, 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.
Environmental Contingency, Loss Exposure in Excess of Accrual, High Estimate | $ 29
Environmental Loss Contingencies Term | 20 years
Environmental Exit Costs, Nature of Costs | 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.

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- Definition High-end of the range estimate of the reasonably possible loss exposure in excess of the total amount accrued for environmental loss contingencies + References No definition available. + Details
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- Definition Estimated time frame of disbursements over which the accrued amounts may be paid out for environmental liabilities. + References No definition available. + 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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- Definition Description of the types of remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 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.Q4) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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