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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($)
$ in Millions

Dec. 31, 2021

Dec. 31, 2020

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

$ 868

$ 485

^[1]

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

69

46

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

432

17

Net Amounts

367

422

Virginia Electric and Power Company

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

^[2]

464

383

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

35

14

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

90

Net Amounts

339

369

Commodity | Over-the-counter

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

95

30

^[1]

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

13

9

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

54

Net Amounts

28

21

Commodity | Over-the-counter | Virginia Electric and Power Company

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

^[2]

84

6

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

8

6

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

54

Net Amounts

22

Commodity | Exchange

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

374

24

^[1]

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

7

24

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

367

Commodity | Exchange | Virginia Electric and Power Company

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

^[2]

43

1

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

7

1

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

36

Interest rate | Over-the-counter

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

399

431

^[1]

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

49

13

Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral

11

17

Net Amounts

339

401

Interest rate | Over-the-counter | Virginia Electric and Power Company

Offsetting Liabilities [Line Items]

Gross Liabilities Presented in the Consolidated Balance Sheet

^[2]

337

376

Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments

20

7

Net Amounts

$ 317

$ 369

[1]	Excludes $1 million of derivative liabilities at December 31, 2020 which are not subject to master netting or similar arrangements.
[2]	Excludes $6 million and $22 million of derivative liabilities at December 31, 2021 and 2020, respectively, which are not subject to master netting or similar arrangements.

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