XML 100 R74.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Fair Value Measurements (Fair Value Quantitative Disclosures) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) $ / gal $ / MWh $ / MMBTU | Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 279 | $ 388
Derivative liabilities |  | 155 | 343
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 194 | 127
Derivative liabilities |  | 31 | 86
Dominion Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  |  | 11
Derivative liabilities |  | 11 | 14
Level 3 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 152 |
Derivative liabilities |  | 2 |
Level 3 | Dominion Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 2 |
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 262 | 364
Derivative liabilities |  | 96 | 160
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 188 | 114
Derivative liabilities |  | 10 | 27
Fair Value, Measurements, Recurring | Dominion Gas Holdings, LLC | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  |  | 11
Derivative liabilities |  | 5 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 147 |
Derivative liabilities |  | 8 |
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 147 | 114
Derivative liabilities |  | 8 | 19
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets | [1] | 70 |
Derivative liabilities | [1] | 2 |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | [2] | 3 |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 7 |
Derivative liabilities |  | 3 |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 3 |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 67 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Minimum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | (2) |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Minimum | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [3] | 0 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Minimum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | (9) |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Maximum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | 4 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Maximum | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [3] | 2 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Maximum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | 3 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Weighted Average | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3],[4] | 4 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Weighted Average | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [3],[4] | 1 |
Fair Value, Measurements, Recurring | Level 3 | Liabilities: | Weighted Average | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3],[4] | 0 |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Minimum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | (2) |
Credit Spreads (percentage) | [5] | 1.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Minimum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | (9) |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Minimum | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | 2 |
Price Volatility (percentage) | [6] | 18.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Minimum | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | 21 |
Price Volatility (percentage) | [6] | 14.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Maximum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | 12 |
Credit Spreads (percentage) | [5] | 4.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Maximum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | 7 |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Maximum | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3] | 7 |
Price Volatility (percentage) | [6] | 50.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Maximum | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3] | 55 |
Price Volatility (percentage) | [6] | 104.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Weighted Average | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3],[4] | 0 |
Credit Spreads (percentage) | [4],[5] | 2.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Weighted Average | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3],[4] | 1 |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Weighted Average | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [3],[4] | 3 |
Price Volatility (percentage) | [4],[6] | 24.00% |
Fair Value, Measurements, Recurring | Level 3 | Assets: | Weighted Average | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [3],[4] | 34 |
Price Volatility (percentage) | [4],[6] | 31.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 145 | 101
Derivative liabilities |  | 2 | 8
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets | [7] | 68 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 7 |
Derivative liabilities |  | 2 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 3 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 67 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Liabilities: | Minimum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | (9) |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Liabilities: | Maximum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | 3 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Liabilities: | Weighted Average | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8],[9] | 0 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Minimum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8] | (2) |
Credit Spreads (percentage) | [5] | 1.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Minimum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | (9) |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Minimum | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8] | 2 |
Price Volatility (percentage) | [10] | 18.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Minimum | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | 21 |
Price Volatility (percentage) | [10] | 14.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Maximum | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8] | 7 |
Credit Spreads (percentage) | [5] | 4.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Maximum | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | 7 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Maximum | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8] | 7 |
Price Volatility (percentage) | [10] | 34.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Maximum | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8] | 55 |
Price Volatility (percentage) | [10] | 104.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Weighted Average | Discounted Cash Flow | Commodity | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8],[9] | 0 |
Credit Spreads (percentage) | [9],[11] | 2.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Weighted Average | Discounted Cash Flow | Commodity | FTRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8],[9] | 1 |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Weighted Average | Option Model | Physical and Financial Options: | Natural Gas |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MMBTU | [8],[9] | 3 |
Price Volatility (percentage) | [9],[10] | 24.00% |
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Assets: | Weighted Average | Option Model | Electricity | Electricity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / MWh | [8],[9] | 34 |
Price Volatility (percentage) | [9],[10] | 31.00% |
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  |  | $ 6
Derivative liabilities |  | $ 2 |
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | $ 2 |
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Liabilities: | Minimum | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [12] | 0 |
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Liabilities: | Maximum | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [12] | 2 |
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Liabilities: | Weighted Average | Discounted Cash Flow | Commodity | NGL's |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Market Price (per Dth, per Gal, per MWh) | $ / gal | [13] | 1 |
[1] | Includes basis.
[2] | Includes NGLs and oil.
[3] | Represents market prices beyond defined terms for Levels 1 and 2.
[4] | Averages weighted by volume.
[5] | Represents credit spreads unrepresented in published markets.
[6] | Represents volatilities unrepresented in published markets.
[7] | Includes basis.
[8] | Represents market prices beyond defined terms for Levels 1 and 2.
[9] | Averages weighted by volume.
[10] | Represents volatilities unrepresented in published markets.
[11] | Represents credit spreads unrepresented in published markets.
[12] | Represents market prices beyond defined terms for Levels 1 and 2.
[13] | Averages weighted by volume.

X
- Definition Fair Value Assumptions, Expected Volatility Rate for Commodity Contracts + References No definition available. + Details
Name: | d_FairValueAssumptionsExpectedVolatilityRateforCommodityContracts
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value Inputs, Offered Quotes for Commodity Contracts + References No definition available. + Details
Name: | d_FairValueInputsOfferedQuotesforCommodityContracts
Namespace Prefix: | d_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + 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_FairValueInputsEntityCreditRisk
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=us-gaap_NaturalGasLiquidsReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=d_FinancialTransmissionRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EnergyRelatedDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=d_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |