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Investments (Marketable Equity and Debt Securities and Cash Equivalents (Classified as Available-for-sale) and Cost Method Investments in Decommissioning Trust Funds) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Total |  | $ 3,149 | $ 3,053 |
Total Unrealized Gains | [1] | 1,515 | 1,443 |
Total Unrealized Losses | [1],[2] | (9) | (12) |
Fair Value |  | 4,655 | 4,484 | [3]
Net assets related to pending sales and purchases of securities |  | 2 | 9 |
Fair value of securities in an unrealized loss position |  | 461 | 576 |
Cost method investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Other Investments |  | 69 | 69 |
Total Unrealized Gains | [1] | 0 | 0 |
Total Unrealized Losses | [1] | 0 | 0 |
Fair Value |  | 69 | 69 |
Cash equivalents and other |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Other Investments | [4] | 6 | 12 |
Total Unrealized Gains | [1],[4] | 0 | 0 |
Total Unrealized Losses | [1],[4] | 0 | 0 |
Fair Value | [4] | 6 | 12 |
Corporate debt instruments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 488 | 478 |
Total Unrealized Gains | [1] | 13 | 13 |
Total Unrealized Losses | [1] | (3) | (4) |
Fair Value |  | 498 | 487 |
Government securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 977 | 978 |
Total Unrealized Gains | [1] | 24 | 22 |
Total Unrealized Losses | [1] | (6) | (8) |
Fair Value |  | 995 | 992 |
Common/collective trust funds |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 66 | 67 |
Total Unrealized Gains | [1] | 0 | 0 |
Total Unrealized Losses | [1] | 0 | 0 |
Fair Value |  | 66 | 67 |
Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Total |  | 1,519 | 1,473 |
Total Unrealized Gains | [5] | 671 | 639 |
Total Unrealized Losses | [5],[6] | (4) | (6) |
Fair Value |  | 2,186 | 2,106 | [7]
Net assets related to pending sales and purchases of securities |  | 4 | 7 |
Fair value of securities in an unrealized loss position |  | 214 | 287 |
Virginia Electric and Power Company | Cost method investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Other Investments |  | 69 | 69 |
Total Unrealized Gains | [5] | 0 | 0 |
Total Unrealized Losses | [5] | 0 | 0 |
Fair Value |  | 69 | 69 |
Virginia Electric and Power Company | Cash equivalents and other |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Other Investments | [8] | 4 | 7 |
Total Unrealized Gains | [5],[8] | 0 | 0 |
Total Unrealized Losses | [5],[8] | 0 | 0 |
Fair Value | [8] | 4 | 7 |
Virginia Electric and Power Company | Corporate debt instruments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 278 | 274 |
Total Unrealized Gains | [5] | 6 | 6 |
Total Unrealized Losses | [5] | (2) | (4) |
Fair Value |  | 282 | 276 |
Virginia Electric and Power Company | Government securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 418 | 420 |
Total Unrealized Gains | [5] | 11 | 9 |
Total Unrealized Losses | [5] | (2) | (2) |
Fair Value |  | 427 | 427 |
Virginia Electric and Power Company | Common/collective trust funds |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 30 | 26 |
Total Unrealized Gains | [5] | 0 | 0 |
Total Unrealized Losses | [5] | 0 | 0 |
Fair Value |  | 30 | 26 |
U.S. | Equity securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 1,543 | 1,449 |
Total Unrealized Gains | [1] | 1,478 | 1,408 |
Total Unrealized Losses | [1] | 0 | 0 |
Fair Value |  | 3,021 | 2,857 |
U.S. | Virginia Electric and Power Company | Equity securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Amortized Cost, Marketable Securities |  | 720 | 677 |
Total Unrealized Gains | [5] | 654 | 624 |
Total Unrealized Losses | [5] | 0 | 0 |
Fair Value |  | $ 1,374 | $ 1,301 |
[1] | Included in AOCI and the nuclear decommissioning trust regulatory liability.
[2] | The fair value of securities in an unrealized loss position was $461 million and $576 million at March 31, 2017 and December 31, 2016, respectively.
[3] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | Includes net pending sales of securities of $2 million and $9 million at March 31, 2017 and December 31, 2016, respectively.
[5] | Included in AOCI and the nuclear decommissioning trust regulatory liability.
[6] | The fair value of securities in an unrealized loss position was $214 million and $287 million at March 31, 2017 and December 31, 2016, respectively.
[7] | Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[8] | Includes pending sales of securities of $4 million and $7 million at March 31, 2017 and December 31, 2016, respectively.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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