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Related-Party Transactions (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | $ 13,178 |  | $ 9,108 |  | $ 10,518 |
Operating revenue |  | $ 3,810 | $ 3,963 | $ 3,059 | $ 3,113 | $ 3,061 | $ 2,815 | $ 2,601 | $ 2,943 | 13,945 |  | 11,420 |  | 11,919 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 7,606 |  | 4,973 |  | 6,077 |
Operating revenue |  | $ 2,437 | $ 2,875 | $ 2,175 | $ 2,167 | $ 1,923 | $ 1,976 | $ 1,741 | $ 1,830 | 9,654 | [1] | 7,470 | [1] | 7,763 | [1]
Virginia Electric and Power Company | Related Party | Commodity Purchases from Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | $ 1,423 |  | $ 742 |  | $ 569 |
Operating Cost and Expense, Related Party, Type [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |
Virginia Electric and Power Company | Related Party | Services provided by affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses | [2] |  |  |  |  |  |  |  |  | $ 519 |  | $ 494 |  | $ 455 |
Operating Cost and Expense, Related Party, Type [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |
Virginia Electric and Power Company | Related Party | Services provided to affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | $ 18 |  | $ 18 |  | $ 18 |
Revenue, Related Party, Type [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |  | Affiliated Entity [Member] |
[1] | See Note 25 for amounts attributable to affiliates.
[2] | Includes capitalized expenditures of $177 million, $161 million and $141 million for the years ended December 31, 2022, 2021 and 2020, respectively.

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