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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  |  |  | $ 1,073 | $ 1,256
Net Gains (Losses) on Trust Investments |  | $ 62 | $ 89 | 165 | 191
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  | 335 | 432 | 1,050 | 1,231
Gross Realized Gains |  | 36 | 30 | 125 | 107
Gross Realized Losses |  | (13) | (12) | (68) | (43)
Net Realized Gains (Losses) | [1] | 23 | 18 | 57 | 64
Unrealized Gain (Loss) on Equity Securities |  | 39 | 70 | 108 | 125
Net Gains (Losses) on Trust Investments |  | 62 | 88 | 165 | 189
Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales of Trust Investments |  | 7 | 10 | 23 | 25
Gross Realized Gains |  | 1 | 0 | 1 | 2
Gross Realized Losses |  | (1) | 0 | (2) | (1)
Net Realized Gains (Losses) | [2] | 0 | (0) | (1) | 1
Unrealized Gain (Loss) on Equity Securities |  | 0 | 1 | 1 | 1
Net Gains (Losses) on Trust Investments |  | $ 0 | $ 1 | $ 0 | $ 2
[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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