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Trust Investments - Schedule of Fair Values and Gross Unrealized Gains and Losses for the Securities Held (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | $ 2,311 | [1] | $ 2,219 | [2]
Gross Unrealized Gains | 495 | [1] | 428 | [2]
Gross Unrealized Losses | (160) | [1] | (124) | [2]
Trust Investments, Fair Value | 2,646 | [1] | 2,523 | [2]
Nuclear Decommissioning Trust (NDT) Fund [Member] | Total Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,384 |  | 1,314 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 10 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (122) |  | (111) |
Debt Securities, Available-for-Sale, Fair Value | 1,266 |  | 1,213 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 508 |  | 482 |
Equity Securities, Accumulated Gross Unrealized Gain | 393 |  | 300 |
Equity Securities, FV-NI, Unrealized Loss | (9) |  | (2) |
Equity Securities, Fair Value | 892 |  | 780 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 419 |  | 423 |
Equity Securities, Accumulated Gross Unrealized Gain | 98 |  | 118 |
Equity Securities, FV-NI, Unrealized Loss | (29) |  | (11) |
Equity Securities, Fair Value | 488 |  | 530 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 927 |  | 905 |
Equity Securities, Accumulated Gross Unrealized Gain | 491 |  | 418 |
Equity Securities, FV-NI, Unrealized Loss | (38) |  | (13) |
Equity Securities, Fair Value | 1,380 |  | 1,310 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 853 |  | 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 | (91) |  | (72) |
Debt Securities, Available-for-Sale, Fair Value | 763 |  | 691 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Obligations [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 531 |  | 555 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (31) |  | (39) |
Debt Securities, Available-for-Sale, Fair Value | 503 |  | 522 |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | 189 |  | 200 |
Gross Unrealized Gains | 9 |  | 8 |
Gross Unrealized Losses | (33) |  | (29) |
Trust Investments, Fair Value | 165 |  | 179 |
Rabbi Trust [Member] | Total Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 181 |  | 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 | (33) |  | (29) |
Debt Securities, Available-for-Sale, Fair Value | 148 |  | 161 |
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 8 |  | 10 |
Equity Securities, Accumulated Gross Unrealized Gain | 9 |  | 8 |
Equity Securities, FV-NI, Unrealized Loss | 0 |  | 0 |
Equity Securities, Fair Value | 17 |  | 18 |
Rabbi Trust [Member] | Government Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 105 |  | 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 | (22) |  | (19) |
Debt Securities, Available-for-Sale, Fair Value | 83 |  | 91 |
Rabbi Trust [Member] | Corporate Debt Obligations [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 76 |  | 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 | (11) |  | (10) |
Debt Securities, Available-for-Sale, Fair Value | $ 65 |  | $ 70 |
[1] | 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.
[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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