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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) Facility | Dec. 31, 2021 USD ($)
Schedule of Trust Investments [Line Items] |  |  |
Number of Nuclear Facilities | Facility |  | 5 |
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
NDT Fund Foreign Currency | $ 3 | $ 3 | $ 2
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) |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
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) |

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