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Kingston Fossil Plant Ash Spill (Details) (USD $)	9 Months Ended
Kingston Fossil Plant Ash Spill (Details) (USD $)	Jun. 30, 2012
Kingston Fossil Plant Ash Spill
Kingston cost estimate low end of range	$ 1,100,000,000
Kingston cost estimate high end of range	1,200,000,000
Total recorded estimate of Kingston cleanup costs	1,100,000,000
Kingston cleanup amounts spent to date	834,000,000
Remaining estimated Kingston liability	290,000,000
Kingston insurance proceeds	$ 45,000,000

Total costs accrued as of the balance sheet date for environmental loss contingencies.

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.