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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Jan. 31, 2021
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Maximum [Member] | Sewaren 7 Claim [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 93 | $ 68

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