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Trust Investments - Amortized Costs Basis, Gross Unrealized Gains And Fair Value Losses For The Securities Held (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | $ 2,388 | [1] | $ 2,388 | [1] | $ 2,311 | [2]
Gross Unrealized Gains | 550 | [1] | 550 | [1] | 495 | [2]
Gross Unrealized Losses | (117) | [1] | (117) | [1] | (160) | [2]
Trust Investments, Fair Value | 2,821 | [1] | 2,821 | [1] | 2,646 | [2]
NDT Fund Foreign Currency | 24 |  | 24 |  | 24 |
Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | 184 |  | 184 |  | 189 |
Gross Unrealized Gains | 9 |  | 9 |  | 9 |
Gross Unrealized Losses | (29) |  | (29) |  | (33) |
Trust Investments, Fair Value | 164 |  | 164 |  | 165 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,413 |  | 1,413 |  | 1,384 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11 |  | 11 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (100) |  | (100) |  | (122) |
Debt Securities, Available-for-Sale, Fair Value | 1,324 |  | 1,324 |  | 1,266 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 176 |  | 176 |  | 181 |
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 | (29) |  | (29) |  | (33) |
Debt Securities, Available-for-Sale, Fair Value | 147 |  | 147 |  | 148 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 975 |  | 975 |  | 927 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 539 |  | 491 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (17) |  | (38) |
Equity Securities, Fair Value | 1,497 |  | 1,497 |  | 1,380 |
Unrealized Gains (Losses) on Equity Securities still held | 98 |  | 113 |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 2 |  | 1 |  |  |
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 571 |  | 571 |  | 531 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 |  | 7 |  | 3 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (23) |  | (23) |  | (31) |
Debt Securities, Available-for-Sale, Fair Value | 555 |  | 555 |  | 503 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 70 |  | 70 |  | 76 |
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 | (9) |  | (9) |  | (11) |
Debt Securities, Available-for-Sale, Fair Value | 61 |  | 61 |  | 65 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 842 |  | 842 |  | 853 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 4 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (77) |  | (77) |  | (91) |
Debt Securities, Available-for-Sale, Fair Value | 769 |  | 769 |  | 763 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 106 |  | 106 |  | 105 |
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 | (20) |  | (20) |  | (22) |
Debt Securities, Available-for-Sale, Fair Value | 86 |  | 86 |  | 83 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 416 |  | 416 |  | 419 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 156 |  | 98 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (10) |  | (29) |
Equity Securities, Fair Value | 562 |  | 562 |  | 488 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 559 |  | 559 |  | 508 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 383 |  | 393 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (7) |  | (9) |
Equity Securities, Fair Value | 935 |  | 935 |  | 892 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 8 |  | 8 |  | 8 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 9 |  | 9 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | 0 |
Equity Securities, Fair Value | $ 17 |  | $ 17 |  | $ 17 |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $24 million as of June 30, 2025, which is part of the NDT Fund.
[2] | The NDT Fund Investments table excludes cash and foreign currency of $24 million as of December 31, 2024, which is part of the NDT Fund.

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