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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Detail) - USD ($)
$ in Millions

Jun. 30, 2022

Dec. 31, 2021

Jun. 30, 2021

Dec. 31, 2020

Cash Cash Equivalents And Restricted Cash [Line Items]

Cash and cash equivalents

^[1]

$ 273

$ 283

$ 259

$ 179

Cash and cash equivalents

272

283

^[2]

Restricted cash and equivalents

^[3],[4]

134

125

45

68

Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows

407

408

304

247

Virginia Electric and Power Company

Cash Cash Equivalents And Restricted Cash [Line Items]

Cash and cash equivalents

56

26

^[5]

49

35

Restricted cash and equivalents

^[4]

2

0

0

0

Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows

$ 58

$ 26

$ 49

$ 35

[1]	At June 30, 2022, June 30, 2021 and December 31, 2020, Dominion Energy had $1 million, $19 million and $7 million of cash and cash equivalents included in current assets held for sale, respectively. No amounts were included in current assets held for sale at December 31, 2021.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	At both June 30, 2021 and December 31, 2020, Dominion Energy had $3 million of restricted cash and equivalents included in current assets held for sale. No amounts were included in current assets held for sale at June 30, 2022 and December 31, 2021.
[4]	Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[5]	Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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