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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | $ 2,219 |  | $ 2,130 |
Gross Unrealized Gains | 428 |  | 301 |
Gross Unrealized Losses | 124 |  | 203 |
Fair Value | 2,523 | [1] | 2,228 | [2]
Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 482 |  | 476 |
Equity Securities, FV-NI, Unrealized Gain | 300 |  | 232 |
Gross Unrealized Losses | (2) |  | (12) |
Fair Value | 780 |  | 696 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 423 |  | 336 |
Equity Securities, FV-NI, Unrealized Gain | 118 |  | 68 |
Gross Unrealized Losses | (11) |  | (28) |
Fair Value | 530 |  | 376 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 905 |  | 812 |
Equity Securities, FV-NI, Unrealized Gain | 418 |  | 300 |
Gross Unrealized Losses | (13) |  | (40) |
Fair Value | 1,310 |  | 1,072 |
Unrealized Gains (Losses) on Equity Securities still held | 166 |  |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 759 |  | 721 |
Gross Unrealized Gains | 4 |  | 0 |
Gross Unrealized Losses | (72) |  | (94) |
Fair Value | 691 |  | 627 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 555 |  | 597 |
Gross Unrealized Gains | 6 |  | 1 |
Gross Unrealized Losses | (39) |  | (69) |
Fair Value | 522 |  | 529 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 1,314 |  | 1,318 |
Gross Unrealized Gains | 10 |  | 1 |
Gross Unrealized Losses | (111) |  | (163) |
Fair Value | 1,213 |  | 1,156 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (59) |  |  |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 200 |  | 213 |
Gross Unrealized Gains | 8 |  | 6 |
Gross Unrealized Losses | 29 |  | 36 |
Fair Value | 179 |  | 183 |
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 10 |  | 14 |
Equity Securities, FV-NI, Unrealized Gain | 8 |  | 6 |
Gross Unrealized Losses | 0 |  | 0 |
Fair Value | 18 |  | 20 |
Rabbi Trust [Member] | Equity Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 2 |  |  |
Rabbi Trust [Member] | Government Obligations [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 110 |  | 110 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (19) |  | (21) |
Fair Value | 91 |  | 89 |
Rabbi Trust [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 80 |  | 89 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (10) |  | (15) |
Fair Value | 70 |  | 74 |
Rabbi Trust [Member] | Debt Securities [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Cost | 190 |  | 199 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (29) |  | (36) |
Fair Value | 161 |  | $ 163 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ (21) |  |  |
[1] | 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.
[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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