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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments |  | $ 369 | $ 402
Net Gains (Losses) on Trust Investments |  | 95 | 46
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments | [1] | 360 | 396
Gross Realized Gains |  | 31 | 21
Gross Realized Losses |  | (14) | (27)
Net Realized Gains (Losses) | [2] | 17 | (6)
Unrealized Gain (Loss) on Equity Securities |  | 78 | 51
Net Gains (Losses) on Trust Investments |  | 95 | 45
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments |  | 9 | 6
Gross Realized Gains |  | 1 | 1
Gross Realized Losses |  | (1) | (1)
Net Realized Gains (Losses) | [3] | 0 | 0
Unrealized Gain (Loss) on Equity Securities |  | 0 | 1
Net Gains (Losses) on Trust Investments |  | $ 0 | $ 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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