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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, 2023 | Dec. 31, 2022
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | $ 2,142 |  | $ 2,130 |
Gross Unrealized Gains | 341 |  | 301 |
Gross Unrealized Losses | (155) |  | (203) |
Trust Investments, Fair Value | 2,328 | [1] | 2,228 | [2]
NDT Fund Foreign Currency | 3 |  | 2 |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | 213 |  | 213 |
Gross Unrealized Gains | 7 |  | 6 |
Gross Unrealized Losses | (30) |  | (36) |
Trust Investments, Fair Value | 190 |  | 183 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,328 |  | 1,318 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (130) |  | (163) |
Debt Securities, Available-for-Sale, Fair Value | 1,203 |  | 1,156 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 200 |  | 199 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (30) |  | (36) |
Debt Securities, Available-for-Sale, Fair Value | 170 |  | 163 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 814 |  | 812 |
Equity Securities, Accumulated Gross Unrealized Gain | 336 |  | 300 |
Equity Securities, FV-NI, Unrealized Loss | (25) |  | (40) |
Equity Securities, Fair Value | 1,125 |  | 1,072 |
Unrealized Gains (Losses) on Equity Securities still held | 56 |  |  |
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 | 593 |  | 597 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (55) |  | (69) |
Debt Securities, Available-for-Sale, Fair Value | 540 |  | 529 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 88 |  | 89 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (12) |  | (15) |
Debt Securities, Available-for-Sale, Fair Value | 76 |  | 74 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 735 |  | 721 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (75) |  | (94) |
Debt Securities, Available-for-Sale, Fair Value | 663 |  | 627 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 112 |  | 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 | (18) |  | (21) |
Debt Securities, Available-for-Sale, Fair Value | 94 |  | 89 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 383 |  | 336 |
Equity Securities, Accumulated Gross Unrealized Gain | 86 |  | 68 |
Equity Securities, FV-NI, Unrealized Loss | (18) |  | (28) |
Equity Securities, Fair Value | 451 |  | 376 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 431 |  | 476 |
Equity Securities, Accumulated Gross Unrealized Gain | 250 |  | 232 |
Equity Securities, FV-NI, Unrealized Loss | (7) |  | (12) |
Equity Securities, Fair Value | 674 |  | 696 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 13 |  | 14 |
Equity Securities, Accumulated Gross Unrealized Gain | 7 |  | 6 |
Equity Securities, FV-NI, Unrealized Loss | 0 |  | 0 |
Equity Securities, Fair Value | 20 |  | $ 20 |
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains recognized in AOCI | (73) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains recognized in AOCI | $ (22) |  |  |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $3 million as of March 31, 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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