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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments |  |  |  |  |  | $ 998 | $ 1,281
Net Gains (Losses) on Trust Investments |  | $ (40) |  | $ (97) |  | 63 | (352)
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments | [1] | 268 |  | 404 |  | 972 | 1,218
Gross Realized Gains |  | 19 |  | 13 |  | 65 | 63
Gross Realized Losses |  | (16) |  | (38) |  | (71) | (103)
Net Realized Gains (Losses) | [2] | 3 |  | (25) |  | (6) | (40)
Unrealized Gain (Loss) on Equity Securities |  | (42) |  | (70) |  | 69 | (301)
Net Gains (Losses) on Trust Investments |  | (39) |  | (95) |  | 63 | (341)
Rabbi Trust [Member] |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments |  | 9 | [1] | 15 | [1] | 26 | 63
Gross Realized Gains |  | 1 |  | 0 |  | 5 | 3
Gross Realized Losses |  | (1) |  | (1) |  | (6) | (7)
Net Realized Gains (Losses) | [3] | 0 |  | (1) |  | (1) | (4)
Unrealized Gain (Loss) on Equity Securities |  | (1) |  | (1) |  | 1 | (7)
Net Gains (Losses) on Trust Investments |  | $ (1) |  | $ (2) |  | $ 0 | $ (11)
[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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