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Nuclear Decommissioning - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Asset Retirement Obligations [Line Items] |  |  |  |  |
Nuclear decommissioning trust funds | $ 17,694,000,000 |  | $ 17,694,000,000 |  | $ 16,398,000,000
Nuclear Decommissioning |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
Net decrease due to changes in, and timing of, estimated future cash flows |  |  | 2,275,000,000 |  |
Net decrease due to changes in assumed retirement dates |  |  | (2,940,000,000) |  |
Net decrease related to changes in timing assumptions |  |  | (138,000,000) |  |
Net increase due to increase in cost escalation rates and lower discount rates |  |  | 803,000,000 |  |
Net increase (decrease) in operating and maintenance expense | 78,000,000 | $ 68,000,000 | 78,000,000 | $ 68,000,000 |
Assets, Total |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
Nuclear decommissioning trust funds | 17,798,000,000 |  | 17,798,000,000 |  | 16,398,000,000
Other Current Assets |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
Nuclear decommissioning trust funds | $ 104,000,000 |  | $ 104,000,000 |  | $ 0

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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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