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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | $ 2,163 |  | $ 2,163 |  | $ 2,130 |
Gross Unrealized Gains | 360 |  | 360 |  | 301 |
Gross Unrealized Losses | (209) |  | (209) |  | (203) |
Trust Investments, Fair Value | 2,314 | [1] | 2,314 | [1] | 2,228 | [2]
NDT Fund Foreign Currency | 2 |  | 2 |  | 2 |
Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | 202 |  | 202 |  | 213 |
Gross Unrealized Gains | 6 |  | 6 |  | 6 |
Gross Unrealized Losses | (41) |  | (41) |  | (36) |
Trust Investments, Fair Value | 167 |  | 167 |  | 183 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,319 |  | 1,319 |  | 1,318 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (178) |  | (178) |  | (163) |
Debt Securities, Available-for-Sale, Fair Value | 1,141 |  | 1,141 |  | 1,156 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 191 |  | 191 |  | 199 |
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 | (41) |  | (41) |  | (36) |
Debt Securities, Available-for-Sale, Fair Value | 150 |  | 150 |  | 163 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 844 |  | 844 |  | 812 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 360 |  | 300 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (31) |  | (40) |
Equity Securities, Fair Value | 1,173 |  | 1,173 |  | 1,072 |
Unrealized Gains (Losses) on Equity Securities still held | (34) |  | 79 |  |  |
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 | 559 |  | 559 |  | 597 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (61) |  | (61) |  | (69) |
Debt Securities, Available-for-Sale, Fair Value | 498 |  | 498 |  | 529 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 82 |  | 82 |  | 89 |
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 | (16) |  | (16) |  | (15) |
Debt Securities, Available-for-Sale, Fair Value | 66 |  | 66 |  | 74 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 760 |  | 760 |  | 721 |
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 | (117) |  | (117) |  | (94) |
Debt Securities, Available-for-Sale, Fair Value | 643 |  | 643 |  | 627 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 109 |  | 109 |  | 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 | (25) |  | (25) |  | (21) |
Debt Securities, Available-for-Sale, Fair Value | 84 |  | 84 |  | 89 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 372 |  | 372 |  | 336 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 80 |  | 68 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (23) |  | (28) |
Equity Securities, Fair Value | 429 |  | 429 |  | 376 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 472 |  | 472 |  | 476 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 280 |  | 232 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (8) |  | (12) |
Equity Securities, Fair Value | 744 |  | 744 |  | 696 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 11 |  | 11 |  | 14 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 6 |  | 6 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | 0 |
Equity Securities, Fair Value | $ 17 |  | 17 |  | $ 20 |
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 |  |  | (104) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains (losses) recognized in AOCI |  |  | $ (30) |  |  |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $2 million as of September 30, 2023, which is part of the NDT Fund.
[2] | The NDT Fund Investments table excludes cash and foreign currency of $2 million as of December 31, 2022, which is part of the NDT Fund.

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