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

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-Topic 235
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