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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Trust Investments [Line Items] |  |  |  |
Net Gains (Losses) on NDT Fund Investments |  | $ 189 | $ (265) | $ 194
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Proceeds from sales | [1] | 1,685 | 1,521 | 1,930
Gross Realized Gains |  | 142 | 86 | 236
Gross Realized Losses |  | 100 | 136 | 70
Net Realized Gains (Losses) on NDT Fund | [2] | 42 | (50) | 166
Net Unrealized Gains (Losses) on Equity Securities |  | 146 | (205) | 19
Net Gains (Losses) on NDT Fund Investments |  | 188 | (255) | 185
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Proceeds from sales |  | 29 | 65 | 170
Gross Realized Gains |  | 5 | 5 | 16
Gross Realized Losses |  | 6 | 9 | 8
Net Realized Gains (Losses) on NDT Fund | [3] | (1) | (4) | 8
Net Unrealized Gains (Losses) on Equity Securities |  | 2 | (6) | 1
Net Gains (Losses) on NDT Fund Investments |  | $ 1 | $ (10) | $ 9
[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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