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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | $ 2,258 |  | $ 2,219 |
Gross Unrealized Gains | 504 |  | 428 |
Gross Unrealized Losses | (135) |  | (124) |
Trust Investments, Fair Value | 2,627 | [1] | 2,523 | [2]
NDT Fund Foreign Currency | 1 |  | 1 |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | 195 |  | 200 |
Gross Unrealized Gains | 9 |  | 8 |
Gross Unrealized Losses | (31) |  | (29) |
Trust Investments, Fair Value | 173 |  | 179 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,326 |  | 1,314 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 |  | 10 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (119) |  | (111) |
Debt Securities, Available-for-Sale, Fair Value | 1,212 |  | 1,213 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 186 |  | 190 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (31) |  | (29) |
Debt Securities, Available-for-Sale, Fair Value | 155 |  | 161 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 932 |  | 905 |
Equity Securities, Accumulated Gross Unrealized Gain | 499 |  | 418 |
Equity Securities, FV-NI, Unrealized Loss | (16) |  | (13) |
Equity Securities, Fair Value | 1,415 |  | 1,310 |
Unrealized Gains (Losses) on Equity Securities still held | 92 |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 1 |  |  |
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 555 |  | 555 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (37) |  | (39) |
Debt Securities, Available-for-Sale, Fair Value | 522 |  | 522 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 78 |  | 80 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (10) |  | (10) |
Debt Securities, Available-for-Sale, Fair Value | 68 |  | 70 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 771 |  | 759 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (82) |  | (72) |
Debt Securities, Available-for-Sale, Fair Value | 690 |  | 691 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 108 |  | 110 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (21) |  | (19) |
Debt Securities, Available-for-Sale, Fair Value | 87 |  | 91 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 418 |  | 423 |
Equity Securities, Accumulated Gross Unrealized Gain | 137 |  | 118 |
Equity Securities, FV-NI, Unrealized Loss | (14) |  | (11) |
Equity Securities, Fair Value | 541 |  | 530 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 514 |  | 482 |
Equity Securities, Accumulated Gross Unrealized Gain | 362 |  | 300 |
Equity Securities, FV-NI, Unrealized Loss | (2) |  | (2) |
Equity Securities, Fair Value | 874 |  | 780 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 9 |  | 10 |
Equity Securities, Accumulated Gross Unrealized Gain | 9 |  | 8 |
Equity Securities, FV-NI, Unrealized Loss | 0 |  | 0 |
Equity Securities, Fair Value | 18 |  | $ 18 |
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains (losses) recognized in AOCI | (67) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains (losses) recognized in AOCI | $ (23) |  |  |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $1 million as of March 31, 2024, which is part of the NDT Fund.
[2] | The NDT Fund Investments table excludes cash and foreign currency of $1 million as of December 31, 2023, which is part of the NDT Fund.

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