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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
Leases Disclosure [Line Items] |  |  |  |  |  |
Property, plant and equipment |  |  | $ 68,862 | $ 58,780 |  |
Accumulated depreciation and amortization |  |  | 25,982 | 24,637 |  |
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 |  |  |  |
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 |  |  | $ 598 |  |  |
Required percentage payment for specific full recourse events |  |  |  |  |  | 100.00%
Lease agreement maturity period |  |  | 5 years |  |  |
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 |  |  |  |  |  | $ 715
Power Purchase Arrangement [Member] |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |
Property, plant and equipment |  |  | $ 382 | 382 |  |
Accumulated depreciation and amortization |  |  | 38 | 28 |  |
Rental revenue |  |  | $ 18 | $ 21 | $ 16 |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Revenues | Revenues | Revenues |
Depreciation expense |  |  | $ 10 | $ 10 | $ 34 |

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