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Contingencies and Legal Proceedings Contingencies (Details) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) Insurance_layers Procedures reactors | Sep. 30, 2020 USD ($)
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 | 145,000,000 |
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline | 490,000,000 |
Maximum retrospective premiums | 43,000,000 |
Estimated future decommissioning cost | $ 6,918,000,000 | $ 6,785,000,000
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 | $ 144,000,000 |
Possible additional future costs for compliance with CCR requirements | 860,000,000 |
Possible additional future costs for compliance with Clean Water requirements. | 160,000,000 |
Estimated liability for cleanup and environmental work | 15,000,000 | 14,000,000
Amount of insurance available for loss at any one site (top range) | 2,800,000,000 |
Long-term debt of VIEs (including current maturities), net | 1,310,000,000 | 1,419,000,000
Legal loss contingency accrual | $ 12,000,000 |
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers | 2 |
Nuclear |  |
Loss Contingencies |  |
Estimated future decommissioning cost | $ 3,351,000,000 | 3,278,000,000
Non-nuclear |  |
Loss Contingencies |  |
Estimated future decommissioning cost | 3,567,000,000 | $ 3,507,000,000
Environmental Agreements |  |
Loss Contingencies |  |
Amount invested in certain environmental projects | 280,000,000 |
General |  |
Loss Contingencies |  |
Long-term debt of VIEs (including current maturities), net | 12,000,000 |
Legal loss contingency accrual | 14,000,000 |
Accounts Payable and Accrued Liabilities | $ 2,000,000 |

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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 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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