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Commitments and Contingencies (Nuclear Insurance) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
Loss Contingencies [Line Items] |  |  |  |
Maximum assessment for premiums on insurance policy |  |  | $ 65 |
Summer |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
NRC minimum requirement |  | $ 1,060 | 1,060 |
Property insurance coverage |  |  |  | $ 2,750
Summer | DESC | European Mutual Association for Nuclear Insurance |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Property damage and outage costs coverage from non-nuclear origin event |  | 1 | $ 1 | $ 415
Secondary Financial Protection Program | Nuclear Plant |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum liability protection per nuclear incident amount | $ 13,700 | $ 13,500 |  |

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