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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, 2022 | Dec. 31, 2021
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | $ 2,154 |  | $ 2,157 |
Gross Unrealized Gains | 429 |  | 510 |
Gross Unrealized Losses | (94) |  | (32) |
Trust Investments, Fair Value | 2,489 | [1] | 2,635 | [2]
NDT Fund Foreign Currency | 2 |  | 2 |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | 222 |  | 226 |
Gross Unrealized Gains | 11 |  | 18 |
Gross Unrealized Losses | (14) |  | (2) |
Trust Investments, Fair Value | 219 |  | 242 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,325 |  | 1,320 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 |  | 28 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (73) |  | (14) |
Debt Securities, Available-for-Sale, Fair Value | 1,257 |  | 1,334 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 207 |  | 212 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (14) |  | (2) |
Debt Securities, Available-for-Sale, Fair Value | 194 |  | 216 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 829 |  | 837 |
Equity Securities, Accumulated Gross Unrealized Gain | 424 |  | 482 |
Equity Securities, FV-NI, Unrealized Loss | (21) |  | (18) |
Equity Securities, Fair Value | 1,232 |  | 1,301 |
Unrealized Gains (Losses) on Equity Securities still held | (47) |  |  |
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 | 649 |  | 637 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 16 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (35) |  | (6) |
Debt Securities, Available-for-Sale, Fair Value | 617 |  | 647 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 96 |  | 105 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 5 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 91 |  | 109 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 676 |  | 683 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 12 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (38) |  | (8) |
Debt Securities, Available-for-Sale, Fair Value | 640 |  | 687 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 111 |  | 107 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (8) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 103 |  | 107 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 333 |  | 346 |
Equity Securities, Accumulated Gross Unrealized Gain | 98 |  | 119 |
Equity Securities, FV-NI, Unrealized Loss | (18) |  | (15) |
Equity Securities, Fair Value | 413 |  | 450 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 496 |  | 491 |
Equity Securities, Accumulated Gross Unrealized Gain | 326 |  | 363 |
Equity Securities, FV-NI, Unrealized Loss | (3) |  | (3) |
Equity Securities, Fair Value | 819 |  | 851 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 15 |  | 14 |
Equity Securities, Accumulated Gross Unrealized Gain | 10 |  | 12 |
Equity Securities, FV-NI, Unrealized Loss | 0 |  | 0 |
Equity Securities, Fair Value | 25 |  | $ 26 |
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 | (40) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains recognized in AOCI | $ (10) |  |  |
[1] | The NDT Fund Investments table excludes foreign currency of $2 million as of March 31, 2022, which is part of the NDT Fund.
[2] | The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2021, which is part of the NDT Fund.

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