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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sale of Trust Investments |  |  |  | $ 814 | $ 721
Net Gains (Losses) on Trust Investments |  | $ 7 | $ 57 | 102 | 103
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sale of Trust Investments | [1] | 439 | 308 | 799 | 704
Gross Realized Gains |  | 46 | 25 | 77 | 46
Gross Realized Losses |  | (17) | (28) | (31) | (55)
Net Realized Gains (Losses) | [2] | 29 | (3) | 46 | (9)
Unrealized Gain (Loss) on Equity Securities |  | (23) | 60 | 55 | 111
Net Gains (Losses) on Trust Investments |  | 6 | 57 | 101 | 102
Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sale of Trust Investments |  | 6 | 11 | 15 | 17
Gross Realized Gains |  | 1 | 3 | 2 | 4
Gross Realized Losses |  | 0 | (4) | (1) | (5)
Net Realized Gains (Losses) | [3] | 1 | (1) | 1 | (1)
Unrealized Gain (Loss) on Equity Securities |  | 0 | 1 | 0 | 2
Net Gains (Losses) on Trust Investments |  | $ 1 | $ 0 | $ 1 | $ 1
[1] | Includes activity in accounts related to the liquidation of funds being transitioned within the trust.
[2] | The cost of these securities was determined on the basis of specific identification.
[3] | 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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