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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($)
$ in Millions

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Investment Holdings [Line Items]

Fixed income securities Fair Value

$ 1,703

Amortized Cost, Total

3,647

$ 3,348

Total Unrealized Gains

2,247

1,662

Total Unrealized Losses

^[1]

(34)

(72)

Fair Value, Total

5,860

4,938

^[2]

Fair value of securities in an unrealized loss position

277

833

Net assets related to pending sales and purchases of securities

3

Virginia Electric and Power Company

Investment Holdings [Line Items]

Fixed income securities Fair Value

839

Amortized Cost, Total

1,708

1,643

Total Unrealized Gains

1,046

760

Total Unrealized Losses

^[3]

(16)

(34)

Fair Value, Total

2,738

2,369

^[4]

Fair value of securities in an unrealized loss position

164

404

Net assets related to pending sales and purchases of securities

5

6

Fixed Income

Investment Holdings [Line Items]

Cash equivalents and other Amortized Cost

^[5]

21

4

Cash equivalents and other Fair Value

^[5]

21

4

Common/collective trust funds | Fixed Income

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

105

76

Fixed income securities Total Unrealized Gains

^[6]

4

Fixed income securities Fair Value

^[6]

109

76

Common/collective trust funds | Fixed Income | Virginia Electric and Power Company

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

46

51

Fixed income securities Fair Value

^[6]

46

51

Equity securities: | U.S.

Investment Holdings [Line Items]

Equity securities Amortized Cost

^[7]

1,787

1,741

Equity securities Total Unrealized Gains

^[7]

2,169

1,640

Equity securities Total Unrealized Losses

^[7]

(30)

(51)

Equity securities Fair Value

^[7]

3,926

3,330

Equity securities: | U.S. | Virginia Electric and Power Company

Investment Holdings [Line Items]

Equity securities Amortized Cost

^[7]

890

858

Equity securities Total Unrealized Gains

^[7]

1,013

751

Equity securities Total Unrealized Losses

^[7]

(15)

(24)

Equity securities Fair Value

^[7]

1,888

1,585

Corporate debt instruments | Fixed Income

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

442

435

Fixed income securities Total Unrealized Gains

^[6]

30

5

Fixed income securities Total Unrealized Losses

^[6]

(9)

Fixed income securities Fair Value

^[6]

472

431

Corporate debt instruments | Fixed Income | Virginia Electric and Power Company

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

257

224

Fixed income securities Total Unrealized Gains

^[6]

16

2

Fixed income securities Total Unrealized Losses

^[6]

(5)

Fixed income securities Fair Value

^[6]

273

221

Government Securities | Fixed Income

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

1,082

1,092

Fixed income securities Total Unrealized Gains

^[6]

44

17

Fixed income securities Total Unrealized Losses

^[6]

(4)

(12)

Fixed income securities Fair Value

^[6]

1,122

1,097

Government Securities | Fixed Income | Virginia Electric and Power Company

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

^[6]

504

504

Fixed income securities Total Unrealized Gains

^[6]

17

7

Fixed income securities Total Unrealized Losses

^[6]

(1)

(5)

Fixed income securities Fair Value

^[6]

520

506

Insurance Contracts

Investment Holdings [Line Items]

Fixed income securities Amortized Cost, Total

210

Fixed income securities Fair Value

210

Cash Equivalents and Other | Virginia Electric and Power Company

Investment Holdings [Line Items]

Cash equivalents and other Amortized Cost

^[8]

11

6

Cash equivalents and other Fair Value

^[8]

$ 11

$ 6

[1]	The fair value of securities in an unrealized loss position was $277 million and $833 million at September 30, 2019 and December 31, 2018, respectively.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	The fair value of securities in an unrealized loss position was $164 million and $404 million at September 30, 2019 and December 31, 2018, respectively.
[4]	Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[5]	Includes pending sales of securities of $3 million at September 30, 2019
[6]	Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability.
[7]	Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[8]	Includes pending sales of securities of $5 million and $6 million at September 30, 2019 and December 31, 2018, respectively.

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