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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net assets measured at fair value on a recurring basis | $ 3,900 |  | $ 3,700
Net Derivative Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  | $ (6)
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
NDT Fund Foreign Currency | $ 1 | $ 1 |

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