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Kingston Fossil Plant Ash Spill Kingston Fossil Plant Ash Spill (Policies)	12 Months Ended
	Sep. 30, 2015
Environmental Remediation Obligations [Abstract]
Kingston Fossil Plant Ash Spill Policy	Financial Impact In August 2009, TVA began using regulatory accounting treatment to defer all actual costs already incurred and expected future costs related to the ash spill. The cost is being charged to expense as it is collected in rates over 15 years, beginning October 1, 2009. As of September 30, 2015, TVA had spent $1.1 billion related to the ash spill. The remaining estimated liability at September 30, 2015 was $6 million and is included in Accounts payable and accrued liabilities.