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Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ (21) | $ (7) | $ (62) | $ (21)
Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | (24) | (20) | (72) | (58)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | 18 | 15 | 37 | 30
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Benefit Costs | $ 3 | $ 3 | $ 8 | $ 7

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