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Variable Interest Entities (VIEs) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | $ 3,755 | $ 2,313 |
Operation and Maintenance | 743 | 794 |
Long Island ServCo [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | 128 | 123 |
Operation and Maintenance | 128 | $ 123 |
Ocean Wind JV Holdco |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 223 |  | $ 225

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