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Trust Investments (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
NDT Fund Foreign Currency | $ 1 | $ 2
Decommissioning Liability, Noncurrent | 1,100 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Minimum |  |
Schedule of Trust Investments [Line Items] |  |
Decommissioning Costs Including Contingencies | 3,000 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Maximum [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Decommissioning Costs Including Contingencies | 3,400 |
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (59) |
Debt Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (21) |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Unrealized Gains (Losses) on Equity Securities still held | 166 |
Equity Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Unrealized Gains (Losses) on Equity Securities still held | $ 2 |

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