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

Sep. 30, 2025

Dec. 31, 2024

Sep. 30, 2024

Dec. 31, 2023

Cash Cash Equivalents And Restricted Cash [Line Items]

Cash and cash equivalents

^[1]

$ 932

$ 310

$ 1,776

$ 217

Cash and cash equivalents

^[2]

932

310

^[3]

Restricted cash and equivalents

^[4],[5],[6]

134

55

126

84

Restricted cash and equivalents

4

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

1,066

365

1,902

301

Virginia Electric and Power Company

Cash Cash Equivalents And Restricted Cash [Line Items]

Cash and cash equivalents

646

^[7]

160

^[7],[8]

28

90

Restricted cash and equivalents

^[5],[6]

125

46

104

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

$ 771

$ 206

$ 132

$ 90

[1]	At December 31, 2023, Dominion Energy had $33 million of cash and cash equivalents included in assets held for sale.
[2]	See Note 15 for amounts attributable to VIEs.
[3]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[4]	At December 31, 2023, Dominion Energy had $4 million of restricted cash and equivalents included in assets held for sale.
[5]	Includes $115 million, $41 million and $100 million at VPFS attributable to VIEs at September 30, 2025, December 31, 2024 and September 30, 2024, respectively.
[6]	Unless otherwise noted, restricted cash and equivalents balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[7]	See Note 15 for amounts attributable to VIEs.
[8]	Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

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