XML 56 R34.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Measurements (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair Value Inputs, Assets, Quantitative Information | The following table presents Dominion's quantitative information about Level 3 fair value measurements at March 31, 2017. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility and credit spreads.
| Fair Value (millions) | Valuation Techniques | Unobservable Input |  | Range | Weighted Average(1)
Assets |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |
Natural gas(2) | $ | 78 |  | Discounted cash flow | Market price (per Dth) | (3) | (2) - 7 | — |
|  |  | Credit Spreads | (4) | 0% - 4% | 2 | %
FTRs | 1 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 3 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 2 |  | Option model | Market price (per Dth) | (3) | 2 - 7 | 3 |
|  |  | Price volatility | (5) | 18% - 48% | 25 | %
Electricity | 60 |  | Option model | Market Price (per MWh) | (3) | 21 - 54 | 33 |
|  |  | Price volatility | (5) | 14% - 68% | 31 | %
Total assets | $ | 141 |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |
Natural gas(2) | $ | 2 |  | Discounted cash flow | Market price (per Dth) | (3) | (1) - 4 | 3 |
FTRs | 8 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 1 |  | Option model | Market price (per Dth) | (3) | 2 - 3 | 3 |
|  |  | Price volatility | (5) | 34% - 48% | 39 | %
Total liabilities | $ | 11 |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents credit spreads unrepresented in published markets.
(5) | Represents volatilities unrepresented in published markets.
Fair Value Inputs, Liabilities, Quantitative Information | The following table presents Dominion's quantitative information about Level 3 fair value measurements at March 31, 2017. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility and credit spreads.
| Fair Value (millions) | Valuation Techniques | Unobservable Input |  | Range | Weighted Average(1)
Assets |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |
Natural gas(2) | $ | 78 |  | Discounted cash flow | Market price (per Dth) | (3) | (2) - 7 | — |
|  |  | Credit Spreads | (4) | 0% - 4% | 2 | %
FTRs | 1 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 3 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 2 |  | Option model | Market price (per Dth) | (3) | 2 - 7 | 3 |
|  |  | Price volatility | (5) | 18% - 48% | 25 | %
Electricity | 60 |  | Option model | Market Price (per MWh) | (3) | 21 - 54 | 33 |
|  |  | Price volatility | (5) | 14% - 68% | 31 | %
Total assets | $ | 141 |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |  |
Natural gas(2) | $ | 2 |  | Discounted cash flow | Market price (per Dth) | (3) | (1) - 4 | 3 |
FTRs | 8 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 1 |  | Option model | Market price (per Dth) | (3) | 2 - 3 | 3 |
|  |  | Price volatility | (5) | 34% - 48% | 39 | %
Total liabilities | $ | 11 |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents credit spreads unrepresented in published markets.
(5) | Represents volatilities unrepresented in published markets.
Significant Unobservable Inputs | 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)
Credit spread | Asset | Increase (decrease) | Loss (gain)
Recurring Fair Value Measurements | The following table presents Dominion’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 March 31, 2017 |  |  |  |
Assets |  |  |  |
Derivatives: |  |  |  |
Commodity | $ | — |  | $ | 113 |  | $ | 141 |  | $ | 254 |
Interest rate | — |  | 20 |  | — |  | 20 |
Investments(1): |  |  |  |
Equity securities: |  |  |  |
U.S. | 3,084 |  | — |  | — |  | 3,084 |
Fixed income: |  |  |  |
Corporate debt instruments | — |  | 498 |  | — |  | 498 |
Government securities | 423 |  | 615 |  | — |  | 1,038 |
Cash equivalents and other | 6 |  | — |  | — |  | 6 |
Total assets | $ | 3,513 |  | $ | 1,246 |  | $ | 141 |  | $ | 4,900 |
Liabilities |  |  |  |
Derivatives: |  |  |  |
Commodity | $ | — |  | $ | 74 |  | $ | 11 |  | $ | 85 |
Interest rate | — |  | 59 |  | — |  | 59 |
Foreign currency | — |  | 6 |  | — |  | 6 |
Total liabilities | $ | — |  | $ | 139 |  | $ | 11 |  | $ | 150 |
At December 31, 2016 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 115 |  | $ | 147 |  | $ | 262 |
Interest rate | — |  | 17 |  | — |  | 17 |
Investments(1): |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |
U.S. | 2,913 |  | — |  | — |  | 2,913 |
Fixed income: |  |  |  |  |  |  |  |
Corporate debt instruments | — |  | 487 |  | — |  | 487 |
Government securities | 424 |  | 614 |  | — |  | 1,038 |
Cash equivalents and other | 5 |  | — |  | — |  | 5 |
Total assets | $ | 3,342 |  | $ | 1,233 |  | $ | 147 |  | $ | 4,722 |
Liabilities |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 88 |  | $ | 8 |  | $ | 96 |
Interest rate | — |  | 53 |  | — |  | 53 |
Foreign currency | — |  | 6 |  | — |  | 6 |
Total liabilities | $ | — |  | $ | 147 |  | $ | 8 |  | $ | 155 |
(1) | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $88 million and $89 million of assets at March 31, 2017 and December 31, 2016, 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, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Dominion's assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category:
| Three Months Ended March 31,
| 2017 | 2016
(millions) |  |
Beginning balance | $ | 139 |  | $ | 95 |
Total realized and unrealized gains (losses): |  |
Included in earnings | (15 | ) | (7 | )
Included in other comprehensive income | — |  | 3 |
Included in regulatory assets/liabilities | (9 | ) | 17 |
Settlements | 12 |  | 8 |
Transfers out of Level 3 | 3 |  | (7 | )
Ending balance | $ | 130 |  | $ | 109 |
Cost and Fair Value of Financial Instruments Disclosure | For the Companies' financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows:
| March 31, 2017 | December 31, 2016
| Carrying Amount | Estimated Fair Value(1) | Carrying Amount | Estimated Fair Value(1)
(millions) |  |  |  |
Dominion |  |  |  |
Long-term debt, including securities due within one year(2) | $ | 28,133 |  | $ | 29,918 |  | $ | 26,587 |  | $ | 28,273 |
Junior subordinated notes(3) | 2,980 |  | 2,981 |  | 2,980 |  | 2,893 |
Remarketable subordinated notes(3) | 2,374 |  | 2,431 |  | 2,373 |  | 2,418 |
Virginia Power |  |  |  |
Long-term debt, including securities due within one year(3) | $ | 11,276 |  | $ | 12,371 |  | $ | 10,530 |  | $ | 11,584 |
Dominion Gas |  |  |  |
Long-term debt, including securities due within one year(4) | $ | 3,533 |  | $ | 3,614 |  | $ | 3,528 |  | $ | 3,603 |
(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 March 31, 2017 and December 31, 2016, includes the valuation of certain fair value hedges associated with fixed rate debt of $(4) million and $(1) 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, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair Value Inputs, Assets, Quantitative Information | The following table presents Virginia Power's quantitative information about Level 3 fair value measurements at March 31, 2017. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility and credit spreads.
| Fair Value (millions) | Valuation Techniques | Unobservable Input |  | Range | Weighted Average(1)
Assets |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |
Natural gas(2) | $ | 77 |  | Discounted cash flow | Market price (per Dth) | (3) | (2) - 7 | — |
|  |  | Credit Spreads | (4) | 0% - 4% | 2 | %
FTRs | 1 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 2 |  | Option model | Market price (per Dth) | (3) | 2 - 7 | 3 |
|  |  | Price Volatility | (5) | 18% - 40% | 25 | %
Electricity | 60 |  | Option model | Market price (per MWh) | (3) | 21 - 54 | 33 |
|  |  | Price Volatility | (5) | 14% - 68% | 31 | %
Total assets | $ | 140 |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |
FTRs | $ | 8 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Total liabilities | $ | 8 |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents credit spreads unrepresented in published markets.
(5) | Represents volatilities unrepresented in published markets.
Fair Value Inputs, Liabilities, Quantitative Information | The following table presents Virginia Power's quantitative information about Level 3 fair value measurements at March 31, 2017. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility and credit spreads.
| Fair Value (millions) | Valuation Techniques | Unobservable Input |  | Range | Weighted Average(1)
Assets |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |
Natural gas(2) | $ | 77 |  | Discounted cash flow | Market price (per Dth) | (3) | (2) - 7 | — |
|  |  | Credit Spreads | (4) | 0% - 4% | 2 | %
FTRs | 1 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Physical and financial options: |  |  |  |  |  |
Natural gas | 2 |  | Option model | Market price (per Dth) | (3) | 2 - 7 | 3 |
|  |  | Price Volatility | (5) | 18% - 40% | 25 | %
Electricity | 60 |  | Option model | Market price (per MWh) | (3) | 21 - 54 | 33 |
|  |  | Price Volatility | (5) | 14% - 68% | 31 | %
Total assets | $ | 140 |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Physical and financial forwards and futures: |  |  |  |  |
FTRs | $ | 8 |  | Discounted cash flow | Market price (per MWh) | (3) | (3) - 2 | — |
Total liabilities | $ | 8 |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Represents market prices beyond defined terms for Levels 1 and 2.
(4) | Represents credit spreads unrepresented in published markets.
(5) | Represents volatilities unrepresented in published markets.
Significant Unobservable Inputs | 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)
Credit spread | Asset | Increase (decrease) | Loss (gain)
Price volatility | Buy | Increase (decrease) | Gain (loss)
Price volatility | Sell | Increase (decrease) | Loss (gain)
Recurring Fair Value Measurements | 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 March 31, 2017 |  |  |  |
Assets |  |  |  |
Derivatives: |  |  |  |
Commodity | $ | — |  | $ | 30 |  | $ | 140 |  | $ | 170 |
Interest rate | — |  | 8 |  | — |  | 8 |
Investments(1): |  |  |  |
Equity securities: |  |  |  |
U.S. | 1,376 |  | — |  | — |  | 1,376 |
Fixed income: |  |  |  |
Corporate debt instruments | — |  | 282 |  | — |  | 282 |
Government securities | 133 |  | 294 |  | — |  | 427 |
Total assets | $ | 1,509 |  | $ | 614 |  | $ | 140 |  | $ | 2,263 |
Liabilities |  |  |  |
Derivatives: |  |  |  |
Commodity | $ | — |  | $ | 3 |  | $ | 8 |  | $ | 11 |
Interest rate | — |  | 22 |  | — |  | 22 |
Total liabilities | $ | — |  | $ | 25 |  | $ | 8 |  | $ | 33 |
At December 31, 2016 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 43 |  | $ | 145 |  | $ | 188 |
Interest rate | — |  | 6 |  | — |  | 6 |
Investments(1): |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |
U.S. | 1,302 |  | — |  | — |  | 1,302 |
Fixed income: |  |  |  |  |  |  |  |
Corporate debt instruments | — |  | 277 |  | — |  | 277 |
Government securities | 136 |  | 291 |  | — |  | 427 |
Total assets | $ | 1,438 |  | $ | 617 |  | $ | 145 |  | $ | 2,200 |
Liabilities |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 8 |  | $ | 2 |  | $ | 10 |
Interest rate | — |  | 21 |  | — |  | 21 |
Total liabilities | $ | — |  | $ | 29 |  | $ | 2 |  | $ | 31 |
(1) | Includes investments held in the nuclear decommissioning trusts. Excludes $30 million and $26 million of assets at March 31, 2017 and December 31, 2016, 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, Assets and Liabilities 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 March 31,
| 2017 | 2016
(millions) |  |
Beginning balance | $ | 143 |  | $ | 93 |
Total realized and unrealized gains (losses): |  |
Included in earnings | (15 | ) | (8 | )
Included in regulatory assets/liabilities | (8 | ) | 17 |
Settlements | 12 |  | 8 |
Ending balance | $ | 132 |  | $ | 110 |
Dominion Gas Holdings, LLC |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Recurring Fair Value Measurements | The following table presents Dominion Gas' liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions. Derivative assets at March 31, 2017 and December 31, 2016 were not material.
| Level 1 | Level 2 | Level 3 | Total
(millions) |  |  |  |
At March 31, 2017 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 1 |  | $ | — |  | $ | 1 |
Foreign currency | — |  | 6 |  | — |  | 6 |
Total liabilities | $ | — |  | $ | 7 |  | $ | — |  | $ | 7 |
At December 31, 2016 |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Commodity | $ | — |  | $ | 3 |  | $ | 2 |  | $ | 5 |
Foreign currency | — |  | 6 |  | — |  | 6 |
Total liabilities | $ | — |  | $ | 9 |  | $ | 2 |  | $ | 11 |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the net change in Dominion Gas' assets and liabilities for derivatives measured at fair value on a recurring basis and included in the Level 3 fair value category:
| Three Months Ended March 31,
| 2017 | 2016
(millions) |  |
Beginning balance | $ | (2 | ) | $ | 6 |
Total realized and unrealized gains (losses): |  |  |
Included in other comprehensive income (loss) | (1 | ) | 2 |
Transfers out of Level 3 | 3 |  | (8 | )
Ending balance | $ | — |  | $ | — |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTableTextBlock
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) the reasons for electing a fair value option for each eligible item or group of similar eligible items and (b) if the fair value option is elected for some but not all eligible items within a group of similar eligible items: (i) a description of those similar items and the reasons for partial election and (ii) information of how the group of similar items relates to individual balance sheet line items; (c) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, information of how each line item in the statement of financial position relates to major categories of assets and liabilities presented in accordance with other fair value disclosures; (2) for items included in the income statement: (a) a description of how interest and dividends are measured and where they are reported in the income statement; (b) how the gains or losses attributable to changes in instrument-specific credit risk were determined; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk: (i) qualitative information about the reasons for the changes and (ii) how the gains and losses attributable to changes in instrument-specific credit risk were determined; and (3) certain other disclosures as required or determined to be provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14210-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14217-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (a),(b),(c)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b),(c)(2),(d)(2)-(3) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
Name: | us-gaap_FairValueOptionQualitativeDisclosuresRelatedToElectionTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
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_DominionGasHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |