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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Parenthetical) (Detail) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative assets | $ 596,000,000 | $ 122,000,000 | [1]
Derivative liabilities | 982,000,000 | 359,000,000 | [1]
Other Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative assets | 1,000,000 | 0 |
Other Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative liabilities | $ 2,000,000 | $ 0 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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