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Nuclear Decommissioning Trust Fund - Summary of Proceeds from Sales of Available-for-sale Securities and Related Gains and Losses (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Regulated Operations [Abstract] |  |
Realized gains | $ 7 | $ 12
Realized losses | (15) | (19)
Proceeds from sale of securities | $ 280 | $ 363

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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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