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LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013 Rate
Commitments and Contingencies Disclosure [Line Items]
Accrued estimated remediation costs	$ 30
Asset retirement obligations	$ 63
Percent of energy derived from biomass for our operations	75.00%

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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