Environmental Matters (Environmental Remediation Costs) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Environmental Matters [Abstract]
Remediation costs incurred	$ 9	$ 9	$ 24	$ 32

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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+ Details