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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations to BHE) (Narrative) (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 31, 2020 | Jul. 31, 2020
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Income tax expense | $ 336,000,000 | $ 83,000,000 | $ 209,000,000 | $ 522,000,000 |  |
GT&S Transaction |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Operating revenue |  | 4,000,000 | $ 6,000,000 | $ 6,000,000 |  |
Derivative payment |  |  |  |  | $ 165,000,000 |
GT&S Transaction | BHE |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  | $ 10,000,000,000
Disposal group, cash consideration |  | 222,000,000 |  |  |  | $ 4,000,000,000.0
Cash proceeds received | 2,700,000,000 |  |  |  |  |
Disposal group, recognized a pre-tax gain upon closing | 127,000,000 |  |  |  |  |
Goodwill write-off | $ 1,400,000,000 |  |  |  |  |
GT&S Transaction | BHE | Transition Service Agreement |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Operating revenue |  | 4,000,000 |  |  |  |
GT&S Transaction | BHE | Cove Point |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Percentage ownership in total units | 50.00% |  |  |  |  |
Disposal group, initial fair value | $ 2,800,000,000 |  |  |  |  |
GT&S Transaction | BHE | General Partner Interest |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Percentage ownership in total units |  |  |  |  |  | 100.00%
GT&S Transaction | BHE | Limited Partner Interests |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Percentage ownership in total units |  |  |  |  |  | 25.00%
Q-Pipe Transaction | BHE |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Disposal group, cash consideration |  |  |  |  | $ 1,300,000,000 |
Disposal group, recognized a pre-tax gain upon closing |  | 450,000,000 |  |  |  |
Goodwill write-off |  | 191,000,000 |  |  |  |
Disposal group, including discontinued operation, deposits | $ 1,300,000,000 |  |  |  |  |
Disposal group, recognized a gain on disposal after tax |  | $ 320,000,000 |  |  |  |

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