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Variable Interest Entities (VIEs) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | $ 2,313 | $ 2,889 |
Operation and Maintenance | 794 | 778 |
Long Island ServCo [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | 123 | 123 |
Operation and Maintenance | 123 | $ 123 |
Ocean Wind JV Holdco |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 124 |  | $ 111
Ocean Wind JV Holdco | Anticipated Spend |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 250 |  |

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