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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | $ 30 |
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (29) | $ (20)
Postretirement Healthcare Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (31) | (24)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 8 | 9
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 2 | $ 3

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