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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Inputs, Assets, Quantitative Information | The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at December 31, 2018. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility.
|  | Fair Value (millions) |  |  | Valuation Techniques |  |  | Unobservable Input |  |  | Range |  |  | Weighted Average(1) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas(2) |  |  | $42 |  |  |  | Discounted cash flow |  |  |  | Market price (per Dth)(3) |  |  |  | (2) - 8 |  |  |  | (1 | )
FTRs |  |  | 15 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (2) - 7 |  |  |  | 1 |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 2 |  |  |  | Option model |  |  |  | Market price (per Dth)(3) |  |  |  | 1 - 8 |  |  |  | 3 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 18% - 73% |  |  |  | 30 | %
Electricity |  |  | 11 |  |  |  | Option model |  |  |  | Market price (per MWh)(3) |  |  |  | 34 - 50 |  |  |  | 42 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 39% - 60% |  |  |  | 49 | %
Total assets |  |  | $70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  |  | $ 6 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (2) - 6 |  |  |  | — |
Total liabilities |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents volatilities unrepresented in published markets.
Fair Value, Option, Qualitative Disclosures | Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows:
Significant Unobservable Inputs |  | Position |  | Change to Input |  | Impact on Fair Value Measurement |
Market price |  | Buy |  | Increase (decrease) |  |  | Gain (loss) |
Market price |  | Sell |  | Increase (decrease) |  |  | Loss (gain) |
Price volatility |  | Buy |  | Increase (decrease) |  |  | Gain (loss) |
Price volatility |  | Sell |  | Increase (decrease) |  |  | Loss (gain) |
Fair Value, by Balance Sheet Grouping | The following table presents Dominion Energy’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions:
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 180 |  |  |  | $ 70 |  |  | $ | 250 |
Interest rate |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Foreign currency |  |  | — |  |  |  | 26 |  |  |  | — |  |  |  | 26 |
Investments(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 3,277 |  |  |  | — |  |  |  | — |  |  |  | 3,277 |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 431 |  |  |  | — |  |  |  | 431 |
Government securities |  |  | 455 |  |  |  | 688 |  |  |  | — |  |  |  | 1,143 |
Cash equivalents and other |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | 11 |
Total assets |  | $ | 3,743 |  |  | $ | 1,343 |  |  |  | $ 70 |  |  | $ | 5,156 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 129 |  |  |  | $ 6 |  |  | $ | 135 |
Interest rate |  |  | — |  |  |  | 142 |  |  |  | — |  |  |  | 142 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  | $ | — |  |  | $ | 273 |  |  |  | $ 6 |  |  | $ | 279 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 101 |  |  |  | $157 |  |  | $ | 258 |
Interest rate |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 17 |
Foreign currency |  |  | — |  |  |  | 32 |  |  |  | — |  |  |  | 32 |
Investments(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 3,493 |  |  |  | — |  |  |  | — |  |  |  | 3,493 |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 444 |  |  |  | — |  |  |  | 444 |
Government securities |  |  | 307 |  |  |  | 794 |  |  |  | — |  |  |  | 1,101 |
Cash equivalents and other |  |  | 34 |  |  |  | — |  |  |  | — |  |  |  | 34 |
Total assets |  | $ | 3,834 |  |  | $ | 1,388 |  |  |  | $157 |  |  | $ | 5,379 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 190 |  |  |  | $ 7 |  |  | $ | 197 |
Interest rate |  |  | — |  |  |  | 85 |  |  |  | — |  |  |  | 85 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  | $ | — |  |  | $ | 277 |  |  |  | $ 7 |  |  | $ | 284 |
(1) | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $220 million and $88 million of assets at December 31, 2018 and 2017, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Dominion Energy’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category:
|  | 2018 |  |  | 2017 |  |  | 2016 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | 150 |  |  | $ | 139 |  |  | $ | 95 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings: |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  | (2 | ) |  |  | 3 |  |  |  | — |
Electric fuel and other energy-related purchases |  |  | (15 | ) |  |  | (42 | ) |  |  | (35 | )
Purchased gas |  |  | — |  |  |  | 1 |  |  |  | — |
Included in other comprehensive income (loss) |  |  | 1 |  |  |  | (2 | ) |  |  | — |
Included in regulatory assets/liabilities |  |  | (44 | ) |  |  | 42 |  |  |  | (39 | )
Settlements |  |  | (27 | ) |  |  | 6 |  |  |  | 38 |
Purchases |  |  | — |  |  |  | — |  |  |  | 87 |
Transfers out of Level 3 |  |  | 1 |  |  |  | 3 |  |  |  | (7 | )
Balance at December 31, |  | $ | 64 |  |  | $ | 150 |  |  | $ | 139 |
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date: |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Electric fuel and other energy-related purchases |  |  | — |  |  |  | — |  |  |  | (1 | )
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | instruments. For the Companies’ financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:
December 31, |  | 2018 |  |  | 2017 |
|  | Carrying Amount |  |  | Estimated Fair Value(1) |  |  | Carrying Amount |  |  | Estimated Fair Value(1) |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year(2) |  | $ | 29,952 |  |  |  | $31,045 |  |  | $ | 28,666 |  |  |  | $31,233 |
Credit facility borrowings |  |  | 73 |  |  |  | 73 |  |  |  | — |  |  |  | — |
Junior subordinated notes(3) |  |  | 3,430 |  |  |  | 3,358 |  |  |  | 3,981 |  |  |  | 4,102 |
Remarketable subordinated notes(3) |  |  | 1,386 |  |  |  | 1,340 |  |  |  | 1,379 |  |  |  | 1,446 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year(3) |  | $ | 11,671 |  |  |  | $12,400 |  |  | $ | 11,346 |  |  |  | $12,842 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year(4) |  | $ | 4,058 |  |  |  | $ 4,072 |  |  | $ | 3,570 |  |  |  | $ 3,719 |
(1) | Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.
(2) | Carrying amount includes amounts which represent, the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At December 31, 2018, and 2017, includes the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt of $(20) million and $(22) million, respectively.
(3) | Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium.
(4) | Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.
Virginia Electric and Power Company |
Fair Value Inputs, Assets, Quantitative Information | The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at December 31, 2018. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility.
|  | Fair Value (millions) |  |  | Valuation Techniques |  |  | Unobservable Input |  |  | Range |  |  | Weighted Average(1) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas(2) |  |  | $38 |  |  |  | Discounted cash flow |  |  |  | Market price (per Dth)(3) |  |  |  | (2)-8 |  |  |  | (1 | )
FTRs |  |  | 15 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (2)-7 |  |  |  | 1 |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 2 |  |  |  | Option model |  |  |  | Market price (per Dth)(3) |  |  |  | 1-8 |  |  |  | 3 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 18%-73% |  |  |  | 30 | %
Electricity |  |  | 11 |  |  |  | Option model |  |  |  | Market price (per MWh)(3) |  |  |  | 34-50 |  |  |  | 42 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 39%-60% |  |  |  | 49 | %
Total assets |  |  | $66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  |  | $ 6 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (2)-6 |  |  |  | — |
Total liabilities |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents volatilities unrepresented in published markets.
Fair Value, Option, Qualitative Disclosures | Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows:
Significant Unobservable Inputs |  | Position |  | Change to Input |  | Impact on Fair Value Measurement |
Market price |  | Buy |  | Increase (decrease) |  |  | Gain (loss) |
Market price |  | Sell |  | Increase (decrease) |  |  | Loss (gain) |
Price volatility |  | Buy |  | Increase (decrease) |  |  | Gain (loss) |
Price volatility |  | Sell |  | Increase (decrease) |  |  | Loss (gain) |
Fair Value, by Balance Sheet Grouping | The following table presents Virginia Power’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions:
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 24 |  |  | $ | 66 |  |  | $ | 90 |
Interest rate |  |  | — |  |  |  | 3 |  |  |  | — |  |  |  | 3 |
Investments(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 1,476 |  |  |  | — |  |  |  | — |  |  |  | 1,476 |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 221 |  |  |  | — |  |  |  | 221 |
Government securities |  |  | 164 |  |  |  | 343 |  |  |  | — |  |  |  | 507 |
Total assets |  | $ | 1,640 |  |  | $ | 591 |  |  | $ | 66 |  |  | $ | 2,297 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | 15 |
Interest rate |  |  | — |  |  |  | 88 |  |  |  | — |  |  |  | 88 |
Total liabilities |  | $ | — |  |  | $ | 97 |  |  | $ | 6 |  |  | $ | 103 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 14 |  |  | $ | 152 |  |  | $ | 166 |
Investments(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 1,566 |  |  |  | — |  |  |  | — |  |  |  | 1,566 |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 224 |  |  |  | — |  |  |  | 224 |
Government securities |  |  | 168 |  |  |  | 326 |  |  |  | — |  |  |  | 494 |
Cash equivalents and other |  |  | 16 |  |  |  | — |  |  |  | — |  |  |  | 16 |
Total assets |  | $ | 1,750 |  |  | $ | 564 |  |  | $ | 152 |  |  | $ | 2,466 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | 9 |
Interest rate |  |  | — |  |  |  | 57 |  |  |  | — |  |  |  | 57 |
Total liabilities |  | $ | — |  |  | $ | 61 |  |  | $ | 5 |  |  | $ | 66 |
(1) | Includes investments held in the nuclear decommissioning trusts. Excludes $160 million and $27 million of assets at December 31, 2018 and 2017, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Virginia Power’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category:
|  | 2018 |  |  | 2017 |  |  | 2016 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | 147 |  |  | $ | 143 |  |  | $ | 93 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings: |  |  |  |  |  |  |  |  |  |  |  |
Electric fuel and other energy-related purchases |  |  | (17 | ) |  |  | (43 | ) |  |  | (35 | )
Included in regulatory assets/liabilities |  |  | (45 | ) |  |  | 40 |  |  |  | (37 | )
Settlements |  |  | (25 | ) |  |  | 7 |  |  |  | 35 |
Purchases |  |  | — |  |  |  | — |  |  |  | 87 |
Balance at December 31, |  | $ | 60 |  |  | $ | 147 |  |  | $ | 143 |
Dominion Energy Gas Holdings, LLC |
Fair Value, by Balance Sheet Grouping | The following table presents Dominion Energy Gas’ assets and liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions:
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  |  | $ — |  |  |  | $ 3 |  |  |  | $ — |  |  |  | $ 3 |
Foreign currency |  |  | — |  |  |  | 26 |  |  |  | — |  |  |  | 26 |
Total assets |  |  | $ — |  |  |  | $29 |  |  |  | $ — |  |  |  | $29 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | $ — |  |  |  | $17 |  |  |  | $ — |  |  |  | $17 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  |  | $ — |  |  |  | $19 |  |  |  | $ — |  |  |  | $19 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency |  |  | $ — |  |  |  | $32 |  |  |  | $ — |  |  |  | $32 |
Total assets |  |  | $ — |  |  |  | $32 |  |  |  | $ — |  |  |  | $32 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  |  | $ — |  |  |  | $ 4 |  |  |  | $ 2 |  |  |  | $ 6 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  |  | $ — |  |  |  | $ 6 |  |  |  | $ 2 |  |  |  | $ 8 |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Dominion Energy Gas’ derivative assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category:
|  | 2018 |  |  | 2017 |  |  | 2016 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | 6 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in other comprehensive income (loss) |  |  | 1 |  |  |  | (3 | ) |  |  | — |
Transfers out of Level 3 |  |  | 1 |  |  |  | 3 |  |  |  | (8 | )
Balance at December 31, |  | $ | — |  |  | $ | (2 | ) |  | $ | (2 | )

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- Definition Fair value options qualitative disclosure related to election. + References No definition available. + Details
Name: | d_FairValueOptionsQualitativeDisclosureRelatedToElectionTextBlock
Namespace Prefix: | d_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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