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Leases (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2024 | Dec. 31, 2020 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Aug. 31, 2024
Leases Disclosure [Line Items] |  |  |  |  |  |  |  |
Payment of settlement of an agreement related to the offshore wind installation vessel under development | $ 47,000,000 |  |  |  |  |  |  |
Charge in connection with settlement of an agreement |  |  |  | $ 47,000,000 |  |  |  |
Charge in connection with settlement of an agreement, after tax |  |  |  | $ 35,000,000 |  |  |  |
Lessor To Complete Construction And Lease Jones Act Compliant Offshore Wind Installation Vessel [Member] |  |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |  |
Requested cash draws from lessor to fund project costs |  |  |  |  |  | $ 544,000,000 |  |
Required percentage payment for specific full recourse events |  | 100.00% |  |  |  |  |  |
Lessor | Lessor To Complete Construction And Lease Jones Act Compliant Offshore Wind Installation Vessel [Member] |  |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |  |
Amount of financing commitments to fund estimated project costs |  |  |  |  |  |  |  | $ 715,000,000
Power Purchase Arrangement |  |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |  |
Rental revenue |  |  | $ 6,000,000 |  | $ 7,000,000 | $ 15,000,000 | $ 18,000,000 |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Revenues |  | Revenues | Revenues | Revenues |
Depreciation expense |  |  | $ 3,000,000 |  |  | $ 6,000,000 | $ 4,000,000 |
Power Purchase Arrangement | Minimum |  |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | $ 1,000,000 |  |  |

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