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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | $ 2,160 |  | $ 2,160 |  | $ 2,157 |
Gross Unrealized Gains | 288 |  | 288 |  | 510 |
Gross Unrealized Losses | (185) |  | (185) |  | (32) |
Trust Investments, Fair Value | 2,263 | [1] | 2,263 | [1] | 2,635 | [2]
NDT Fund Foreign Currency | 3 |  | 3 |  | 2 |
Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | 219 |  | 219 |  | 226 |
Gross Unrealized Gains | 6 |  | 6 |  | 18 |
Gross Unrealized Losses | (28) |  | (28) |  | (2) |
Trust Investments, Fair Value | 197 |  | 197 |  | 242 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,328 |  | 1,328 |  | 1,320 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 1 |  | 28 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (131) |  | (131) |  | (14) |
Debt Securities, Available-for-Sale, Fair Value | 1,198 |  | 1,198 |  | 1,334 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 205 |  | 205 |  | 212 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (28) |  | (28) |  | (2) |
Debt Securities, Available-for-Sale, Fair Value | 177 |  | 177 |  | 216 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 832 |  | 832 |  | 837 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 287 |  | 482 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (54) |  | (18) |
Equity Securities, Fair Value | 1,065 |  | 1,065 |  | 1,301 |
Unrealized Gains (Losses) on Equity Securities still held | (166) |  | (209) |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | (5) |  | (6) |  |  |
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 649 |  | 649 |  | 637 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 1 |  | 16 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (63) |  | (63) |  | (6) |
Debt Securities, Available-for-Sale, Fair Value | 587 |  | 587 |  | 647 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 91 |  | 91 |  | 105 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 5 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (13) |  | (13) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 78 |  | 78 |  | 109 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 679 |  | 679 |  | 683 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 12 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (68) |  | (68) |  | (8) |
Debt Securities, Available-for-Sale, Fair Value | 611 |  | 611 |  | 687 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 114 |  | 114 |  | 107 |
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 | (15) |  | (15) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 99 |  | 99 |  | 107 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 334 |  | 334 |  | 346 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 55 |  | 119 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (37) |  | (15) |
Equity Securities, Fair Value | 352 |  | 352 |  | 450 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 498 |  | 498 |  | 491 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 232 |  | 363 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (17) |  | (3) |
Equity Securities, Fair Value | 713 |  | 713 |  | 851 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 14 |  | 14 |  | 14 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 6 |  | 12 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | 0 |
Equity Securities, Fair Value | $ 20 |  | 20 |  | $ 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 |  |  | (76) |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains recognized in AOCI |  |  | $ (20) |  |  |
[1] | The NDT Fund Investments table excludes cash and foreign currency of $3 million as of June 30, 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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