XML 90 R42.htm IDEA: XBRL DOCUMENT
v3.19.3

Fair Value Measurements (Tables) | Nov. 18, 2019
--- | ---
Fair Value Inputs, Assets, Quantitative Information | The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at June 30, 2019. 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) |  | $ | 76 |  |  | Discounted cash flow |  |  | Market price (per Dth) (3) |  |  | (2) - 6 |  |  | (1 | )
FTRs |  |  | 7 |  |  | Discounted cash flow |  |  | Market price (per MWh) (3) |  |  | (1) - 4 |  |  | 1 |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 1 |  |  | Option model |  |  | Market price (per Dth) (3) |  |  | 2 - 12 |  |  | 4 |
|  |  |  |  |  |  |  |  | Price volatility (4) |  |  | 2% - 34% |  |  | 19 | %
Total assets |  | $ | 84 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  | $ | 3 |  |  | Discounted cash flow |  |  | Market price (per MWh) (3) |  |  | (4) - 4 |  |  | — |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 6 |  |  | Option model |  |  | Market price (per Dth) (3) |  |  | 1 - 8 |  |  | 3 |
|  |  |  |  |  |  |  |  | Price volatility (4) |  |  | 2% - 71% |  |  | 29 | %
Total liabilities |  | $ | 9 |  |  |  |  |  |  |  |  |  |  |  |  |
(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, Options, 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) |  |  |  |  |  |  |  |  |  |  |  |
At June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 104 |  |  | $ | 84 |  |  | $ | 188 |
Interest rate |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 7 |
Foreign currency |  |  | — |  |  |  | 14 |  |  |  | — |  |  |  | 14 |
Investments (1) : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 3,826 |  |  |  | — |  |  |  | — |  |  |  | 3,826 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | 500 |
Government securities |  |  | 488 |  |  |  | 668 |  |  |  | — |  |  |  | 1,156 |
Cash equivalents and other |  |  | 19 |  |  |  | — |  |  |  | — |  |  |  | 19 |
Total assets |  | $ | 4,333 |  |  | $ | 1,293 |  |  | $ | 84 |  |  | $ | 5,710 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | 6 |  |  | $ | 54 |  |  | $ | 9 |  |  | $ | 69 |
Interest rate |  |  | — |  |  |  | 557 |  |  |  | — |  |  |  | 557 |
Total liabilities |  | $ | 6 |  |  | $ | 611 |  |  | $ | 9 |  |  | $ | 626 |
At 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 securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
(1) | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $210 million and $220 million of assets at June 30, 2019 and December 31, 2018, 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:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 53 |  |  | $ | 120 |  |  | $ | 64 |  |  | $ | 150 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  | 3 |  |  |  | — |  |  |  | 2 |  |  |  | (1 | )
Purchased gas |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |
Electric fuel and other energy-related purchases |  |  | (3 | ) |  |  | (2 | ) |  |  | (7 | ) |  |  | (19 | )
Included in other comprehensive income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Included in regulatory assets/liabilities |  |  | 18 |  |  |  | 11 |  |  |  | 25 |  |  |  | (10 | )
Settlements |  |  | 3 |  |  |  | (10 | ) |  |  | 2 |  |  |  | (3 | )
Purchases |  |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | — |
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | 1 |
Ending balance |  | $ | 75 |  |  | $ | 119 |  |  | $ | 75 |  |  | $ | 119 |
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets/liabilities still held at the reporting date: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Purchased gas |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |
Total |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | For the Companies’ financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | 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) |  | $ | 34,217 |  |  | $ | 37,631 |  |  | $ | 29,952 |  |  | $ | 31,045 |
Credit facility borrowings |  |  | — |  |  |  | — |  |  |  | 73 |  |  |  | 73 |
Junior subordinated notes (3) |  |  | 4,795 |  |  |  | 4,898 |  |  |  | 3,430 |  |  |  | 3,358 |
Remarketable subordinated notes (3) |  |  | — |  |  |  | — |  |  |  | 1,386 |  |  |  | 1,340 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year (3) |  | $ | 11,293 |  |  | $ | 12,840 |  |  | $ | 11,671 |  |  | $ | 12,400 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year (4) |  | $ | 7,481 |  |  | $ | 7,693 |  |  | $ | 7,770 |  |  | $ | 7,803 |
Affiliated long-term debt |  |  | 395 |  |  |  | 395 |  |  |  | — |  |  |  | —
Credit facility borrowings |  |  | — |  |  |  | — |  |  |  | 73 |  |  |  | 73 |
(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 issues 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 June 30, 2019 and December 31, 2018, includes the valuation of certain fair value hedges associated with fixed rate debt of $2 million and $(20) 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 June 30, 2019. 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) |  | $ | 74 |  |  | Discounted cash flow |  |  | Market price (per Dth) (3) |  |  | (2) - 3 |  |  | (1 | )
FTRs |  |  | 7 |  |  | Discounted cash flow |  |  | Market price (per MWh) (3) |  |  | (1) - 4 |  |  | 1 |
Total assets |  | $ | 81 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  | $ | 3 |  |  | Discounted cash flow |  |  | Market price (per MWh) (3) |  |  | (4) - 4 |  |  | — |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 1 |  |  | Option model |  |  | Market price (per Dth) (3) |  |  | 1 - 7 |  |  | 3 |
|  |  |  |  |  |  |  |  | Price volatility (4) |  |  | 20% - 71% |  |  | 38 | %
Total liabilities |  | $ | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
(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, Options, 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) |  |  |  |  |  |  |  |  |  |  |  |
At June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 2 |  |  | $ | 81 |  |  | $ | 83 |
Investments (1) : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | 1,753 |  |  |  | — |  |  |  | — |  |  |  | 1,753 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt instruments |  |  | — |  |  |  | 257 |  |  |  | — |  |  |  | 257 |
Government securities |  |  | 205 |  |  |  | 313 |  |  |  | — |  |  |  | 518 |
Total assets |  | $ | 1,958 |  |  | $ | 572 |  |  | $ | 81 |  |  | $ | 2,611 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 22 |  |  | $ | 4 |  |  | $ | 26 |
Interest rate |  |  | — |  |  |  | 332 |  |  |  | — |  |  |  | 332 |
Total liabilities |  | $ | — |  |  | $ | 354 |  |  | $ | 4 |  |  | $ | 358 |
At 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 securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
(1) | Includes investments held in the nuclear decommissioning trusts. Excludes $153 million and $160 million of ​​​​​​​assets at June 30, 2019 and December 31, 2018, 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:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 59 |  |  | $ | 117 |  |  | $ | 60 |  |  | $ | 147 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric fuel and other energy-related purchases |  |  | (3 | ) |  |  | (2 | ) |  |  | (7 | ) |  |  | (19 | )
Included in regulatory assets/liabilities |  |  | 18 |  |  |  | 8 |  |  |  | 26 |  |  |  | (11 | )
Settlements |  |  | 3 |  |  |  | (8 | ) |  |  | (2 | ) |  |  | (2 | )
Ending balance |  | $ | 77 |  |  | $ | 115 |  |  | $ | 77 |  |  | $ | 115 |
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) |  |  |  |  |  |  |  |  |  |  |  |
At June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Foreign currency |  |  | — |  |  |  | 14 |  |  |  | — |  |  |  | 14 |
Total assets |  | $ | — |  |  | $ | 16 |  |  | $ | — |  |  | $ | 16 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | $ | — |  |  | $ | 77 |  |  | $ | — |  |  | $ | 77 |
Total liabilities |  | $ | — |  |  | $ | 77 |  |  | $ | — |  |  | $ | 77 |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Interest rate |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Foreign currency |  |  | — |  |  |  | 26 |  |  |  | — |  |  |  | 26 |
Total assets |  | $ | — |  |  | $ | 31 |  |  | $ | — |  |  | $ | 31 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | $ | — |  |  | $ | 17 |  |  | $ | — |  |  | $ | 17 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  | $ | — |  |  | $ | 19 |  |  | $ | — |  |  | $ | 19 |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Dominion Energy Gas’ assets and liabilities for derivatives measured at fair value on a recurring basis and included in the Level 3 fair value category. There were no net changes in assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category for the three and six months ended June 30, 2019 and the three months ended June 30, 2018.
|  | Six Months Ended |
|  | June 30, |
|  | 2018 |
(millions) |  |  |
Beginning balance |  | $ | (2 | )
Total realized and unrealized gains: |  |  |  |
Included in other comprehensive income |  |  | 1 |
Transfers out of Level 3 |  |  | 1 |
Ending balance |  | $ | — |

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

X
- 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=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_DominionEnergyGasHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |