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Supplementary Financial Information - Summary of Fair Market Value of Investments in the Fund (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Nuclear decommissioning trust | $ 1,951 | $ 1,648
Debt Securities |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Nuclear decommissioning trust | $ 734 | $ 658
Debt, weighted average interest rate | 3.19% | 2.64%
Decommissioning fund investments, debt securities, average maturity | 11 years | 11 years
Equity Securities |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Nuclear decommissioning trust | $ 1,217 | $ 990

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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