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Regulatory Assets and Liabilities (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Regulatory Assets and Liabilities
Current regulatory assets	$ 183,000,000	$ 414,000,000
Non-current regulatory assets	6,755,000,000	6,612,000,000
Regulatory assets	6,938,000,000	7,026,000,000
Current regulatory liabilities	161,000,000	187,000,000
Regulatory Liability, Noncurrent	64,000,000	104,000,000
Regulatory liabilities	225,000,000	291,000,000
Deferred other post-retirement benefits cost
Regulatory Assets and Liabilities
Regulatory Liability, Noncurrent	57,929,500	73,000,000
Fuel cost adjustment tax equivalents
Regulatory Assets and Liabilities
Current regulatory liabilities	138,101,147	146,000,000
Fuel cost adjustment receivable/liability
Regulatory Assets and Liabilities
Current regulatory liabilities	10,381,590	0
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory liabilities	12,725,050	41,000,000
Regulatory Liability, Noncurrent	6,268,417	31,000,000
Gallatin coal combustion residual facilities(1)
Regulatory Assets and Liabilities
Gallatin coal combustion residual facilities estimated cost to cap and close	0	38,000,000
Non-nuclear decommissioning costs(1)
Regulatory Assets and Liabilities
Current regulatory assets	84,688,584	73,000,000
Non-current regulatory assets	1,049,124,788	692,000,000
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory assets	33,311,105	4,000,000
Non-current regulatory assets	9,190,385	8,000,000
Fuel cost adjustment receivable/liability
Regulatory Assets and Liabilities
Current regulatory assets	0	30,000,000
Deferred nuclear generating units
Regulatory Assets and Liabilities
Current regulatory assets	92,320	3,000,000
Non-current regulatory assets	11,812,039	11,000,000
Environmental cleanup costs - Kingston ash spill
Regulatory Assets and Liabilities
Current regulatory assets	65,098,615	266,000,000
Gallatin coal combustion residuals facilities(1)
Regulatory Assets and Liabilities
Non-current regulatory assets	847,320,430	861,000,000
Deferred pension costs and other post-retirement benefits costs
Regulatory Assets and Liabilities
Non-current regulatory assets	2,940,156,660	3,119,000,000
Nuclear decommissioning costs
Regulatory Assets and Liabilities
Non-current regulatory assets	0	784,000,000
Environmental agreements
Regulatory Assets and Liabilities
Non-current regulatory assets	1,761,385,120	1,019,000,000
Other non-current regulatory assets
Regulatory Assets and Liabilities
Non-current regulatory assets	$ 136,845,232	$ 118,000,000

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Gallatin coal combustion residual facilities estimated cost to cap and close

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Regulatory Assets and Liabilities [Line Items]

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

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