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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Leases Disclosure [Line Items] |  |  |  |  |  |
Payment of settlement of an agreement related to the offshore wind installation vessel under development | $ 47 |  |  |  |  |
Charge in connection with settlement of an agreement |  |  |  | $ 47 |  |
Charge in connection with settlement of an agreement, after tax |  |  |  | $ 35 |  |
Power Purchase Arrangement |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |
Rental revenue |  | $ 5 | $ 6 |  | $ 9 | $ 9
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | Revenues |  | Revenues | Revenues
Depreciation expense |  | $ 4 |  |  | $ 5 | $ 3
Power Purchase Arrangement | Maximum |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |
Depreciation expense |  |  | $ 1 |  |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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