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Variable Interest Entities (VIEs) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | $ 9,722 | $ 9,603 | $ 10,076
Operation and Maintenance | 3,226 | 3,115 | 3,111
Long Island ServCo [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Revenues | 511 | 520 | 490
Operation and Maintenance | 511 | $ 520 | $ 490
Ocean Wind JV Holdco |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 111 |  |
Ocean Wind JV Holdco | Carrying Value |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 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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