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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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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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