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Trust Investments - Schedule of Proceeds from the Sales of and Net Realized Gains (Losses) on Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  |  |  | $ 731 | $ 814
Net Gains (Losses) on Trust Investments |  | $ 95 | $ 7 | 103 | 102
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  | 328 | 439 | 715 | 799
Gross Realized Gains |  | 41 | 46 | 89 | 77
Gross Realized Losses |  | (26) | (17) | (55) | (31)
Net Realized Gains (Losses) | [1] | 15 | 29 | 34 | 46
Unrealized Gain (Loss) on Equity Securities |  | 79 | (23) | 69 | 55
Net Gains (Losses) on Trust Investments |  | 94 | 6 | 103 | 101
Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  | 9 | 6 | 16 | 15
Gross Realized Gains |  | 0 | 1 | 0 | 2
Gross Realized Losses |  | (1) | 0 | (1) | (1)
Net Realized Gains (Losses) | [2] | (1) | 1 | (1) | 1
Unrealized Gain (Loss) on Equity Securities |  | 2 | (0) | 1 | (0)
Net Gains (Losses) on Trust Investments |  | $ 1 | $ 1 | $ 0 | $ 1
[1] | The cost of these securities was determined on the basis of specific identification.
[2] | The cost of these securities was determined on the basis of specific identification.

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- Definition Amount of realized gain 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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