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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Requested cash draws from lessor to fund project costs |  |  |  | $ 383 |
Required percentage payment for specific full recourse events | 100.00% |  |  |  |
Lease maturity term | 2027-11 |  |  |  |
Lessor | Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Amount of financing commitments to fund estimated project costs | $ 625 |  |  |  |
Power Purchase Arrangement |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Rental revenue |  | $ 7 | $ 6 | 18 | $ 17
Depreciation expense |  |  | $ 9 |  | $ 26
Power Purchase Arrangement | Maximum |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Depreciation expense |  | $ 1 |  | $ 4 |

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