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Trust Investments (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | $ 284 | $ 188
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (11) | (6)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 752 | 793
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (124) | (118)
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 11 | 6
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0 | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 137 | 143
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (31) | (29)
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 83 | 79
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (9) | (5)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 23 | 32
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (7) | (8)
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 201 | 109
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (2) | (1)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 729 | 761
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (117) | (110)
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 11 | 6
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0 | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 137 | 143
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (31) | (29)
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 22 | 44
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (1) | (1)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 5 | 4
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (1) | 0
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 61 | 35
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (8) | (4)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 18 | 28
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (6) | (8)
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 153 | 90
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (2) | (1)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 429 | 432
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (80) | (71)
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 6 | 3
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0 | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 80 | 83
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (21) | (19)
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 48 | 19
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0 | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 300 | 329
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | (37) | (39)
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [1] | 5 | 3
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [1] | 0 | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | [1] | 57 | 60
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, | [1] | $ (10) | $ (10)
[1] | .

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