Environmental Matters (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2011
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Environmental Matters Disclosure [Abstract] | |
Estimated environmental capital expenditures from 2012 through 2016 | $ 553 |
Acid rain allowance ratio | 1 |
Impairment charge on emission allowances | $ 160 |
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- Definition
Acid Rain Allowance Ratio No definition available.
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- Definition
Amount of estimated environmental capital expenditures to be incurred during the remainder of the current fiscal year and for the next four years to meet the company's environmental commitments. No definition available.
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- Details
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- Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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