Liabilities for Dispositions and Discontinued Operations Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 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 June 30, 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.