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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Leases Disclosure [Line Items] |  |  |
Charge in connection with settlement of an agreement |  | $ 47 |
Charge in connection with settlement of an agreement, after tax |  | 35 |
Forecast |  |  |
Leases Disclosure [Line Items] |  |  |
Payment of settlement of an agreement related to the offshore wind installation vessel under development | $ 47 |  |
Power Purchase Arrangement |  |  |
Leases Disclosure [Line Items] |  |  |
Rental revenue |  | $ 3 | $ 5
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | Revenues
Depreciation expense |  | $ 3 | $ 1

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