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Commitments and Contingencies - Table (Details) $ in Millions | Sep. 30, 2022 USD ($) megawatts | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
--- | --- | --- | ---
Obligations |  |  |  |
Megawatts provided under transmission obligations | megawatts |  | 2,450 |  |
Accrual for Environmental Loss Contingencies, Gross |  | $ 17 | $ 18 |
Estimated future decommissioning cost | [1] | 7,162 | 7,002 | $ 6,785
CT and QTE outstanding leaseback obligation |  |  | 25 |
Nuclear |  |  |  |
Obligations |  |  |  |
Estimated future decommissioning cost |  | $ 3,643 | $ 3,428 | $ 3,278
[1] | (1) Includes $275 million a nd $266 million at September 30, 2022 and 2021, respectively, in Current liabilities. (2) Settlements include the change in asset retirement obligation project accruals included in Accounts payable and accrued liabilities of $20 million.

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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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