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Contingencies and Legal Proceedings Contingencies (Details) | 9 Months Ended |
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Jun. 30, 2023 USD ($) reactors Procedures Insurance_layers | Sep. 30, 2022 USD ($)
Loss Contingencies |  |
Nuclear liability insurance | $ 450,000,000 |
Assessment from licensees for each licensed reactor | $ 138,000,000 |
Number of licensed reactors in US | reactors | 96 |
Nuclear accident assessment limitation per year per unit | $ 20,000,000 |
Maximum assessment per nuclear incident | 963,000,000 |
Total amount of protection available | 13,700,000,000 |
Amount of insurance available for loss at any one site | 2,100,000,000 |
Maximum amount of retrospective premiums | 114,000,000 |
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline | 490,000,000 |
Maximum retrospective premiums | 44,000,000 |
Estimated future decommissioning cost | $ 7,122,000,000 | $ 7,162,000,000
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures | 2 |
Possible additional future costs for compliance with Clean Air Act requirements | $ 231,000,000 |
Possible additional future costs for compliance with CCR requirements | 711,000,000 |
Possible additional future costs for compliance with Clean Water requirements. | 48,000,000 |
Estimated liability for cleanup and environmental work | 16 | 17,000,000
Amount of insurance available for loss at any one site (top range) | 2,800,000,000 |
Long-term debt of VIEs, net (including current maturities) | 988,000,000 | 989,000,000
Legal loss contingency accrual | $ 28,000,000 |
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers | 2 |
Nuclear |  |
Loss Contingencies |  |
Estimated future decommissioning cost | $ 3,773,000,000 | 3,643,000,000
Non-nuclear |  |
Loss Contingencies |  |
Estimated future decommissioning cost | $ 3,349,000,000 | $ 3,519,000,000

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- Definition The amount of property, decommissioning, and decontamination insurance available for loss at any one site to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
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- Definition Amount of insurance available for loss at any one site (top range) + References No definition available. + Details
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- Definition An assessment from licensees for each licensed nuclear reactor in the United States to fund the second layer, the Secondary Financial Program. + References No definition available. + Details
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- Definition The maximum idemnity per unit if an accident covered by the policy tasks or keeps a nuclear unit offline. + References No definition available. + Details
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- Definition For the first layer of protection all NRC nuclear plant licensees purchase nuclear insurance from American Nuclear Insurers for each nuclear plant with an operating license. + References No definition available. + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-7 + Details
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