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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 20 | $ (29)
Postretirement Healthcare Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (11) | (31)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 18 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 3 | 2
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 5 | $ 8

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