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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 1,314 | $ 868
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 325 | 69
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 622 | 432
Net Amounts |  | 367 | 367
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 507 | 464
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 55 | 35
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 251 | 90
Net Amounts |  | 201 | 339
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 326 | 95
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 37 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 124 | 54
Net Amounts |  | 165 | 28
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 167 | 84
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 10 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 124 | 54
Net Amounts |  | 33 | 22
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 622 | 374
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 130 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 492 | 367
Net Amounts |  | 0 | 0
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 136 | 43
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 9 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 127 | 36
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 362 | 399
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 158 | 49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 6 | 11
Net Amounts |  | 198 | 339
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 200 | 337
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 36 | 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 164 | 317
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 4 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 4 | 0
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 4 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 4 | $ 0
[1] | There were no derivative liabilities that are not subject to master netting or similar arrangements at March 31, 2022 or December 31, 2021.
[2] | Excludes $1 million and $6 million of derivative liabilities at March 31, 2022 and December 31, 2021, respectively, which are not subject to master netting or similar arrangements.

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