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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019 | Jul. 31, 2016
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Property, plant and equipment |  |  | $ 58,780 | $ 52,312 |  |  |
Accumulated depreciation and amortization |  |  | 24,637 | 23,396 |  |  |
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 |  |  | $ 422 |  |  |  |
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 |  |  |  |  |  |
Lessor | New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Amount of financing commitments to fund estimated project costs |  |  |  |  |  | $ 465 | $ 365
Leasing arrangement, charge |  |  |  |  | $ 62 |  |
Leasing arrangement, charge after tax |  |  |  |  | 46 |  |
Lease effective termination date |  | 2021-04 |  |  |  |  |
Power Purchase Arrangement [Member] |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Property, plant and equipment |  |  | $ 382 | 381 |  |  |
Accumulated depreciation and amortization |  |  | 28 | 18 |  |  |
Rental revenue |  |  | $ 21 | $ 16 | $ 168 |  |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Revenues | Revenues | Revenues |  |
Depreciation expense |  |  | $ 10 | $ 34 | $ 110 |  |

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