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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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Built to suit lease arrangement, indemnification agreements, maximum percentage payment of funded amount in full recourse events.

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Charge in connection with settlement of an agreement, after tax.

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Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

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