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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Recorded Value |  | $ 1,643 |  |
Amortized Cost, Total |  | 3,557 | $ 3,348 |
Total Unrealized Gains |  | 2,046 | 1,662 |
Total Unrealized Losses | [1] | (23) | (72) |
Recorded Value, Total |  | 5,580 | 4,938 | [2]
Fair value of securities in an unrealized loss position |  | 405 | 833 |
Net assets related to pending sales and purchases of securities |  | 4 |  |
Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Recorded Value |  | 800 |  |
Amortized Cost, Total |  | 1,659 | 1,643 |
Total Unrealized Gains |  | 943 | 760 |
Total Unrealized Losses | [3] | (11) | (34) |
Recorded Value, Total |  | 2,591 | 2,369 | [4]
Fair value of securities in an unrealized loss position |  | 178 | 404 |
Net assets related to pending sales and purchases of securities |  | 7 | 6 |
Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other Amortized Cost | [5] | 6 | 4 |
Cash equivalents and other Recorded Value | [5] | 6 | 4 |
Insurance Contracts |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total |  | 199 |  |
Fixed income securities Recorded Value |  | 199 |  |
Cash Equivalents and Other [Member] | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other Amortized Cost | [6] | 7 | 6 |
Cash equivalents and other Recorded Value | [6] | 7 | 6 |
Common/collective trust funds | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 72 | 76 |
Fixed income securities Recorded Value | [7] | 72 | 76 |
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 48 | 51 |
Fixed income securities Recorded Value | [7] | 48 | 51 |
Corporate debt instruments | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 457 | 435 |
Fixed income securities Total Unrealized Gains | [7] | 15 | 5 |
Fixed income securities Total Unrealized Losses | [7] | (2) | (9) |
Fixed income securities Recorded Value | [7] | 470 | 431 |
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 227 | 224 |
Fixed income securities Total Unrealized Gains | [7] | 7 | 2 |
Fixed income securities Total Unrealized Losses | [7] | (1) | (5) |
Fixed income securities Recorded Value | [7] | 233 | 221 |
Government Securities | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 1,076 | 1,092 |
Fixed income securities Total Unrealized Gains | [7] | 29 | 17 |
Fixed income securities Total Unrealized Losses | [7] | (4) | (12) |
Fixed income securities Recorded Value | [7] | 1,101 | 1,097 |
Government Securities | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [7] | 506 | 504 |
Fixed income securities Total Unrealized Gains | [7] | 14 | 7 |
Fixed income securities Total Unrealized Losses | [7] | (1) | (5) |
Fixed income securities Recorded Value | [7] | 519 | 506 |
Equity securities: | U.S. |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [8] | 1,747 | 1,741 |
Equity securities Total Unrealized Gains | [8] | 2,002 | 1,640 |
Equity securities Total Unrealized Losses | [8] | (17) | (51) |
Equity securities Recorded Value | [8] | 3,732 | 3,330 |
Equity securities: | U.S. | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [8] | 871 | 858 |
Equity securities Total Unrealized Gains | [8] | 922 | 751 |
Equity securities Total Unrealized Losses | [8] | (9) | (24) |
Equity securities Recorded Value | [8] | $ 1,784 | $ 1,585 |
[1] | The fair value of securities in an unrealized loss position was $405 million and $833 million at March 31, 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 $178 million and $404 million at March 31, 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 $4 million at March 31, 2019.
[6] | Includes pending sales of securities of $7 million and $6 million at March 31, 2019 and December 31, 2018, respectively.
[7] | Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability.
[8] | Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.

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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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