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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ (21) | $ (7) | $ (41) | $ (14)
Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | (24) | (19) | (48) | (38)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 10 | 7 | 19 | 15
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 37 |  | 37 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ 2 | $ 2 | $ 5 | $ 4

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