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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | $ 2,312 |  | $ 2,312 |  | $ 2,219 |
Gross Unrealized Gains | 486 |  | 486 |  | 428 |
Gross Unrealized Losses | (147) |  | (147) |  | (124) |
Trust Investments, Fair Value | 2,651 | [1] | 2,651 | [1] | 2,523 | [2]
NDT Fund Foreign Currency | 1 |  | 1 |  | 1 |
Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | 194 |  | 194 |  | 200 |
Gross Unrealized Gains | 9 |  | 9 |  | 8 |
Gross Unrealized Losses | (32) |  | (32) |  | (29) |
Trust Investments, Fair Value | 171 |  | 171 |  | 179 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,361 |  | 1,361 |  | 1,314 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 3 |  | 10 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (125) |  | (125) |  | (111) |
Debt Securities, Available-for-Sale, Fair Value | 1,239 |  | 1,239 |  | 1,213 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 185 |  | 185 |  | 190 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (32) |  | (32) |  | (29) |
Debt Securities, Available-for-Sale, Fair Value | 153 |  | 153 |  | 161 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 951 |  | 951 |  | 905 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 483 |  | 418 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (22) |  | (13) |
Equity Securities, Fair Value | 1,412 |  | 1,412 |  | 1,310 |
Unrealized Gains (Losses) on Equity Securities still held | 14 |  | 88 |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 1 |  | 1 |  |  |
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 562 |  | 562 |  | 555 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 2 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (37) |  | (37) |  | (39) |
Debt Securities, Available-for-Sale, Fair Value | 527 |  | 527 |  | 522 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 77 |  | 77 |  | 80 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (11) |  | (11) |  | (10) |
Debt Securities, Available-for-Sale, Fair Value | 66 |  | 66 |  | 70 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 799 |  | 799 |  | 759 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 1 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (88) |  | (88) |  | (72) |
Debt Securities, Available-for-Sale, Fair Value | 712 |  | 712 |  | 691 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 108 |  | 108 |  | 110 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (21) |  | (21) |  | (19) |
Debt Securities, Available-for-Sale, Fair Value | 87 |  | 87 |  | 91 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 405 |  | 405 |  | 423 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 121 |  | 118 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (17) |  | (11) |
Equity Securities, Fair Value | 509 |  | 509 |  | 530 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 546 |  | 546 |  | 482 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 362 |  | 300 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (5) |  | (2) |
Equity Securities, Fair Value | 903 |  | 903 |  | 780 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 9 |  | 9 |  | 10 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 9 |  | 8 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | 0 |
Equity Securities, Fair Value | $ 18 |  | 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 |  |  | (71) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains (losses) recognized in AOCI |  |  | $ (24) |  |  |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $1 million as of June 30, 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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