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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 | $ 2 | $ 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 | (40) |
Debt Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | (10) |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
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) |

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