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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
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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 | $ 2,500 |  | $ 2,500
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 | (4) |  | $ (12)
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
NDT Fund Foreign Currency | $ 2 | $ 2 |

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