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Supplementary Financial Information - Summary of Fair Market Value of Investments in the Fund (Details) - USD ($) $ in Millions	12 Months Ended
	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

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