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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |
Available-For-Sale Securities | Dominion's decommissioning trust funds are summarized below:
| Amortized Cost |  | Total Unrealized Gains (1) |  | Total Unrealized Losses (1) |  |  | Fair Value |
(millions) |  |  |  |  |
At December 31, 2016 |  |  |  |  |
Marketable equity securities: |  |  |  |  |
U.S. | $ | 1,449 |  | $ | 1,408 |  | $ | — |  |  | $ | 2,857 |
Fixed income: |  |  |  |  |  |  |  |  |
Corporate debt instruments | 478 |  | 13 |  | (4 | ) |  | 487 |
Government securities | 978 |  | 22 |  | (8 | ) |  | 992 |
Common/collective trust funds | 67 |  | — |  | — |  |  | 67 |
Cost method investments | 69 |  | — |  | — |  |  | 69 |
Cash equivalents and other(2) | 12 |  | — |  | — |  |  | 12 |
Total | $ | 3,053 |  | $ | 1,443 |  | $ | (12 | ) | (3) | $ | 4,484 |
At December 31, 2015 |  |  |  |  |  |  |  |  |
Marketable equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 1,354 |  | $ | 1,217 |  | $ | — |  |  | $ | 2,571 |
Fixed income: |  |  |  |  |  |  |  |  |
Corporate debt instruments | 436 |  | 11 |  | (7 | ) |  | 440 |
Government securities | 962 |  | 30 |  | (4 | ) |  | 988 |
Common/collective trust funds | 100 |  | — |  | — |  |  | 100 |
Cost method investments | 70 |  | — |  | — |  |  | 70 |
Cash equivalents and other(2) | 14 |  | — |  | — |  |  | 14 |
Total | $ | 2,936 |  | $ | 1,258 |  | $ | (11 | ) | (3) | $ | 4,183 |
(1) | Included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
(2) | Includes pending sales of securities of $9 million and $12 million at December 31, 2016 and 2015, respectively.
(3) | The fair value of securities in an unrealized loss position was $576 million and $592 million at December 31, 2016 and 2015, respectively.
Investments Classified by Contractual Maturity Date | The fair value of Dominion's marketable debt securities held in nuclear decommissioning trust funds at December 31, 2016 by contractual maturity is as follows:
| Amount |
(millions) |
Due in one year or less | $ | 192 |
Due after one year through five years | 418 |
Due after five years through ten years | 368 |
Due after ten years | 568 |
Total | $ | 1,546 |
Marketable Securities | Presented below is selected information regarding Dominion's marketable equity and debt securities held in nuclear decommissioning trust funds:
Year Ended December 31, | 2016 |  | 2015 |  | 2014 |
(millions) |  |  |
Proceeds from sales | $ | 1,422 |  | $ | 1,340 |  | $ | 1,235 |
Realized gains(1) | 128 |  | 219 |  | 171 |
Realized losses(1) | 55 |  | 84 |  | 30 |
(1) | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Other Than Temporary Impairment Losses On Investment Securities | Dominion recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows:
Year Ended December 31, | 2016 |  | 2015 |  | 2014 |
(millions) |  |  |
Total other-than-temporary impairment losses(1) | $ | 51 |  | $ | 66 |  | $ | 21 |
Losses recorded to nuclear decommissioning trust regulatory liability | (16 | ) | (26 | ) | (5 | )
Losses recognized in other comprehensive income (before taxes) | (12 | ) | (9 | ) | (3 | )
Net impairment losses recognized in earnings | $ | 23 |  | $ | 31 |  | $ | 13 |
(1) | Amounts include other-than-temporary impairment losses for debt securities of $13 million, $9 million and $3 million at December 31, 2016, 2015 and 2014, respectively.
Investments Accounts Under Equity Method of Accounting | Investments that Dominion and Dominion Gas account for under the equity method of accounting are as follows:
Company | Ownership% |  |  | Investment Balance |  | Description
As of December 31, |  |  | 2016 |  | 2015 |  |
(millions) |  |  |  |  |  |  |  |
Dominion |  |  |  |  |
Blue Racer | 50 | % |  | $ | 677 |  | $ | 661 |  | Midstream gas and related services
Atlantic Coast Pipeline | 48 | % |  | 256 |  | 59 |  | Gas transmission system
Iroquois | 50 | % | (1) | 316 |  | 324 |  | Gas transmission system
Fowler Ridge | 50 | % |  | 116 |  | 125 |  | Wind-powered merchant generation facility
NedPower | 50 | % |  | 112 |  | 119 |  | Wind-powered merchant generation facility
Other | various |  |  | 84 |  | 32 |  |
Total |  |  | $ | 1,561 |  | $ | 1,320 |  |
Dominion Gas |  |  |  |  |
Iroquois | 24.07 | % |  | $ | 98 |  | $ | 102 |  | Gas transmission system
Total |  |  | $ | 98 |  | $ | 102 |  |
(1) | Comprised of Dominion Midstream's interest of 25.93% and Dominion Gas' interest of 24.07%. See Note 15 for more information.
Virginia Electric and Power Company |
Schedule of Available-for-sale Securities [Line Items] |
Available-For-Sale Securities | Virginia Power's decommissioning trust funds are summarized below:
| Amortized Cost |  | Total Unrealized Gains (1) |  | Total Unrealized Losses (1) |  |  | Fair Value |
(millions) |  |  |  |  |
At December 31, 2016 |  |  |  |  |
Marketable equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 677 |  | $ | 624 |  | $ | — |  |  | $ | 1,301 |
Fixed income: |  |  |  |  |  |  |  |  |
Corporate debt instruments | 274 |  | 6 |  | (4 | ) |  | 276 |
Government securities | 420 |  | 9 |  | (2 | ) |  | 427 |
Common/collective trust funds | 26 |  | — |  | — |  |  | 26 |
Cost method investments | 69 |  | — |  | — |  |  | 69 |
Cash equivalents and other(2) | 7 |  | — |  | — |  |  | 7 |
Total | $ | 1,473 |  | $ | 639 |  | $ | (6 | ) | (3) | $ | 2,106 |
At December 31, 2015 |  |  |  |  |  |  |  |  |
Marketable equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 633 |  | $ | 528 |  | $ | — |  |  | $ | 1,161 |
Fixed income: |  |  |  |  |  |  |  |  |
Corporate debt instruments | 238 |  | 5 |  | (5 | ) |  | 238 |
Government securities | 421 |  | 15 |  | (2 | ) |  | 434 |
Common/collective trust funds | 34 |  | — |  | — |  |  | 34 |
Cost method investments | 70 |  | — |  | — |  |  | 70 |
Cash equivalents and other(2) | 8 |  | — |  | — |  |  | 8 |
Total | $ | 1,404 |  | $ | 548 |  | $ | (7 | ) | (3) | $ | 1,945 |
(1) | Included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
(2) | Includes pending sales of securities of $7 million and $8 million at December 31, 2016 and 2015, respectively.
(3) | The fair value of securities in an unrealized loss position was $287 million and $281 million at December 31, 2016 and 2015, respectively.
Investments Classified by Contractual Maturity Date | The fair value of Virginia Power's marketable debt securities at December 31, 2016, by contractual maturity is as follows:
| Amount |
(millions) |
Due in one year or less | $ | 55 |
Due after one year through five years | 181 |
Due after five years through ten years | 208 |
Due after ten years | 285 |
Total | $ | 729 |
Marketable Securities | Presented below is selected information regarding Virginia Power's marketable equity and debt securities held in nuclear decommissioning trust funds.
Year Ended December 31, | 2016 |  | 2015 |  | 2014 |
(millions) |  |  |
Proceeds from sales | $ | 733 |  | $ | 639 |  | $ | 549 |
Realized gains(1) | 63 |  | 110 |  | 73 |
Realized losses(1) | 27 |  | 43 |  | 12 |
(1) | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Other Than Temporary Impairment Losses On Investment Securities | Virginia Power recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows:
Year Ended December 31, | 2016 |  | 2015 |  | 2014 |
(millions) |  |  |
Total other-than-temporary impairment losses(1) | $ | 26 |  | $ | 36 |  | $ | 8 |
Losses recorded to nuclear decommissioning trust regulatory liability | (16 | ) | (26 | ) | (4 | )
Losses recorded in other comprehensive income (before taxes) | (7 | ) | (6 | ) | (2 | )
Net impairment losses recognized in earnings | $ | 3 |  | $ | 4 |  | $ | 2 |
(1) | Amounts include other-than-temporary impairment losses for debt securities of $8 million, $6 million and $2 million at December 31, 2016, 2015 and 2014, respectively.

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