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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 2,258 | $ 493
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 714 | 69
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1,544 | 424
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 899 | 271
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 176 | 35
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 723 | 236
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 367 | 153
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 11 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 356 | 140
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 297 | 110
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 290 | 102
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 292 | 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 287 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 5 | 2
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 0 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 1,593 | 323
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 410 | 49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1,183 | 274
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 596 | 146
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 163 | 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 433 | 126
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 6 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 8
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 6 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | $ 0 | $ 8
[1] | Excludes $211 million and $120 million of derivative assets at September 30, 2022 and December 31, 2021, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $62 million and $29 million of derivative assets at September 30, 2022 and December 31, 2021, respectively, which are not subject to master netting or similar arrangements.

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