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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2017
Dominion Energy Gas Holdings, LLC |
Fair Value Measurements | NOTE 6. FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. However, the use of a mid-market pricing convention (the mid-point between bid and ask prices) is permitted. Fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. This includes not only the credit standing of counterparties involved and the impact of credit enhancements but also the impact of the Companies’ own nonperformance risk on their liabilities. Fair value measurements assume that the transaction occurs in the principal market for the asset or liability (the market with the most volume and activity for the asset or liability from the perspective of the reporting entity), or in the absence of a principal market, the most advantageous market for the asset or liability (the market in which the reporting entity would be able to maximize the amount received or minimize the amount paid). Dominion Energy applies fair value measurements to certain assets and liabilities including commodity, interest rate, and foreign currency derivative instruments, and other investments including those held in nuclear decommissioning, Dominion Energy’s rabbi, and pension and other postretirement benefit plan trusts, in accordance with the requirements discussed above. Virginia Power applies fair value measurements to certain assets and liabilities including commodity and interest rate derivative instruments and other investments including those held in the nuclear decommissioning trust, in accordance with the requirements discussed above. Dominion Energy Gas applies fair value measurements to certain assets and liabilities including commodity, interest rate, and foreign currency derivative instruments and other investments including those held in pension and other postretirement benefit plan trusts, in accordance with the requirements described above. The Companies apply credit adjustments to their derivative fair values in accordance with the requirements described above. Inputs and Assumptions The Companies maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value is based on actively-quoted market prices, if available. In the absence of actively-quoted market prices, price information is sought from external sources, including broker quotes and industry publications. When evaluating pricing information provided by brokers and other pricing services, the Companies consider whether the broker is willing and able to trade at the quoted price, if the broker quotes are based on an active market or an inactive market and the extent to which brokers are utilizing a particular model if pricing is not readily available. If pricing information from external sources is not available, or if the Companies believe that observable pricing is not indicative of fair value, judgment is required to develop the estimates of fair value. In those cases the Companies must estimate prices based on available historical and near-term future price information and certain statistical methods, including regression analysis, that reflect their market assumptions. The Companies’ commodity derivative valuations are prepared by Dominion Energy’s ERM department. The ERM department creates daily mark-to-market valuations for the Companies’ derivative transactions using computer-based statistical models. The inputs that go into the market valuations are transactional information stored in the systems of record and market pricing information that resides in data warehouse databases. The majority of forward prices are automatically uploaded into the data warehouse databases from various third-party sources. Inputs obtained from third-party sources are evaluated for reliability considering the reputation, independence, market presence, and methodology used by the third-party. If forward prices are not available from third-party sources, then the ERM department models the forward prices based on other available market data. A team consisting of risk management and risk quantitative analysts meets each business day to assess the validity of market prices and mark-to-market valuations. During this meeting, the changes in mark-to-market valuations from period to period are examined and qualified against historical expectations. If any discrepancies are identified during this process, the mark-to-market valuations or the market pricing information is evaluated further and adjusted, if necessary. For options and contracts with option-like characteristics where observable pricing information is not available from external sources, Dominion Energy and Virginia Power generally use a modified Black-Scholes Model that considers time value, the volatility of the underlying commodities and other relevant assumptions when estimating fair value. Dominion Energy and Virginia Power use other option models under special circumstances, including a Spread Approximation Model when contracts include different commodities or commodity locations and a Swing Option Model when contracts allow either the buyer or seller the ability to exercise within a range of quantities. For contracts with unique characteristics, the Companies may estimate fair value using a discounted cash flow approach deemed appropriate in the circumstances and applied consistently from period to period. For individual contracts, the use of different valuation models or assumptions could have a significant effect on the contract’s estimated fair value. The inputs and assumptions used in measuring fair value include the following: For commodity derivative contracts:
| • |  | Forward commodity prices
| • |  | Transaction prices
| • |  | Price volatility
| • |  | Price correlation
| • |  | Volumes
| • |  | Commodity location
| • |  | Interest rates
| • |  | Credit quality of counterparties and the Companies
| • |  | Credit enhancements
| • |  | Time value
For interest rate derivative contracts:
| • |  | Interest rate curves
| • |  | Credit quality of counterparties and the Companies
| • |  | Notional value
| • |  | Credit enhancements
| • |  | Time value
For foreign currency derivative contracts:
| • |  | Foreign currency forward exchange rates
| • |  | Interest rates
| • |  | Credit quality of counterparties and the Companies
| • |  | Notional value
| • |  | Credit enhancements
| • |  | Time value
For investments:
| • |  | Quoted securities prices and indices
| • |  | Securities trading information including volume and restrictions
| • |  | Maturity
| • |  | Interest rates
| • |  | Credit quality
The Companies regularly evaluate and validate the inputs used to estimate fair value by a number of methods, including review and verification of models, as well as various market price verification procedures such as the use of pricing services and multiple broker quotes to support the market price of the various commodities and investments in which the Companies transact. Levels The Companies also utilize the following fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels:
• |  | Level 1—Quoted prices (unadjusted) in active markets for identical assets and liabilities that they have the ability to access at the measurement date. Instruments categorized in Level 1 primarily consist of financial instruments such as certain exchange-traded derivatives, and exchange-listed equities, U.S. and international equity securities, mutual funds and certain Treasury securities held in nuclear decommissioning trust funds for Dominion Energy and Virginia Power, benefit plan trust funds for Dominion Energy and Dominion Energy Gas, and rabbi trust funds for Dominion Energy.
• |  | Level 2—Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 primarily include commodity forwards and swaps, interest rate swaps, foreign currency swaps and cash and cash equivalents, corporate debt instruments, government securities and other fixed income investments held in nuclear decommissioning trust funds for Dominion Energy and Virginia Power, benefit plan trust funds for Dominion Energy and Dominion Energy Gas and rabbi trust funds for Dominion Energy.
• |  | Level 3—Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability. Instruments categorized in Level 3 for the Companies consist of long-dated commodity derivatives, FTRs, certain natural gas and power options and other modeled commodity derivatives.
The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. In these cases, the lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability. Alternative investments, consisting of investments in partnerships, joint ventures and other alternative investments held in nuclear decommissioning and benefit plan trust funds, are generally valued using NAV based on the proportionate share of the fair value as determined by reference to the most recent audited fair value financial statements or fair value statements provided by the investment manager adjusted for any significant events occurring between the investment manager’s and the Companies’ measurement date. Alternative investments recorded at NAV are not classified in the fair value hierarchy. For derivative contracts, the Companies recognize transfers among Level 1, Level 2 and Level 3 based on fair values as of the first day of the month in which the transfer occurs. Transfers out of Level 3 represent assets and liabilities that were previously classified as Level 3 for which the inputs became observable for classification in either Level 1 or Level 2. Because the activity and liquidity of commodity markets vary substantially between regions and time periods, the availability of observable inputs for substantially the full term and value of the Companies’ over-the-counter derivative contracts is subject to change. Level 3 Valuations Fair value measurements are categorized as Level 3 when price or other inputs that are considered to be unobservable are significant to their valuations. Long-dated commodity derivatives are generally based on unobservable inputs due to the length of time to settlement and the absence of market activity and are therefore categorized as Level 3. FTRs are categorized as Level 3 fair value measurements because the only relevant pricing available comes from ISO auctions, which are generally not considered to be liquid markets. Other modeled commodity derivatives have unobservable inputs in their valuation, mostly due to non-transparent and illiquid markets. The Companies enter into certain physical and financial forwards, futures, options and swaps, which are considered Level 3 as they have one or more inputs that are not observable and are significant to the valuation. The discounted cash flow method is used to value Level 3 physical and financial forwards and futures contracts. An option model is used to value Level 3 physical and financial options. The discounted cash flow model for forwards and futures calculates mark-to-market valuations based on forward market prices, original transaction prices, volumes, risk-free rate of return, and credit spreads. The option model calculates mark-to-market valuations using variations of the Black-Scholes option model. The inputs into the models are the forward market prices, implied price volatilities, risk-free rate of return, the option expiration dates, the option strike prices, the original sales prices, and volumes. For Level 3 fair value measurements, certain forward market prices and implied price volatilities are considered unobservable. The unobservable inputs are developed and substantiated using historical information, available market data, third-party data, and statistical analysis. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party pricing sources. The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at December 31, 2017. 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) |  |  | $ 84 |  |  |  | Discounted cash flow |  |  |  | Market price (per Dth)(4) |  |  |  | (2) - 14 |  |  |  | — |
FTRs |  |  | 29 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(4) |  |  |  | (1) - 7 |  |  |  | 2 |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 1 |  |  |  | Option model |  |  |  | Market price (per Dth)(4) |  |  |  | 2 - 7 |  |  |  | 3 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (5) |  |  |  | 26% - 54% |  |  |  | 33 | %
Electricity |  |  | 43 |  |  |  | Option model |  |  |  | Market price (per MWh)(4) |  |  |  | 22 - 74 |  |  |  | 37 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (5) |  |  |  | 13% - 63% |  |  |  | 33 | %
Total assets |  |  | $157 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquids(3) |  |  | $ 2 |  |  |  | Discounted cash flow |  |  |  | Market price (per Gal)(4) |  |  |  | 0 - 2 |  |  |  | 1 |
FTRs |  |  | $ 5 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(4) |  |  |  | (4) - 6 |  |  |  | — |
Total liabilities |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Includes basis.
(3) | Includes NGLs and oil.
(4) | Represents market prices beyond defined terms for Levels 1 and 2.
(5) | Represents volatilities unrepresented in published markets.
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) |
Nonrecurring Fair Value Measurements DOMINION ENERGY See Note 9 for information regarding an impairment charge recognized associated with Dominion Energy’s equity method investment in Fowler Ridge. ATLANTIC COAST PIPELINE GUARANTEE AGREEMENT In October 2017, Dominion Energy entered into a guarantee agreement in connection with Atlantic Coast Pipeline’s obligation under a $3.4 billion revolving credit facility. See Note 22 for more information about the guarantee agreement associated with Atlantic Coast Pipeline’s revolving credit facility. Dominion Energy recorded a liability of $30 million, the fair value of the guarantee at inception, associated with the guarantee agreement. The fair value was estimated using a discounted cash flow method and is considered a Level 3 fair value measurement due to the use of a significant unobservable input related to the interest rate differential between the interest rate charged on the guaranteed revolving credit facility and the estimated interest rate that would have been charged had the loan not been guaranteed. Recurring Fair Value Measurements Fair value measurements are separately disclosed by level within the fair value hierarchy with a separate reconciliation of fair value measurements categorized as Level 3. Fair value disclosures for assets held in Dominion Energy’s and Dominion Energy Gas’ pension and other postretirement benefit plans are presented in Note 21. DOMINION ENERGY 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, 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 |
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 December 31, 2017 and 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.
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:
|  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | 139 |  |  | $ | 95 |  |  | $ | 107 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (38 | ) |  |  | (35 | ) |  |  | (5 | )
Included in other comprehensive loss |  |  | (2 | ) |  |  | — |  |  |  | (9 | )
Included in regulatory assets/liabilities |  |  | 42 |  |  |  | (39 | ) |  |  | (4 | )
Settlements |  |  | 6 |  |  |  | 38 |  |  |  | 9 |
Purchases |  |  | — |  |  |  | 87 |  |  |  | — |
Transfers out of Level 3 |  |  | 3 |  |  |  | (7 | ) |  |  | (3 | )
Balance at December 31, |  | $ | 150 |  |  | $ | 139 |  |  | $ | 95 |
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 |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 2 |
The following table presents Dominion Energy’s gains and losses included in earnings in the Level 3 fair value category:
|  | Operating Revenue |  |  | Electric Fuel and Other Energy-Related Purchases |  |  | Purchased Gas |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in earnings |  |  | $ 3 |  |  |  | $(42 | ) |  |  | $ 1 |  |  | $ | (38 | )
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 |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in earnings |  |  | $— |  |  |  | $(35 | ) |  |  | $— |  |  | $ | (35 | )
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 |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in earnings |  |  | $ 6 |  |  |  | $(11 | ) |  |  | $— |  |  | $ | (5 | )
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 |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | 2 |
VIRGINIA POWER The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at December 31, 2017. 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) |  |  | $ 81 |  |  |  | Discounted cash flow |  |  |  | Market price (per Dth)(3) |  |  |  | (2)-7 |  |  |  | (1 | )
FTRs |  |  | 27 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (1)-7 |  |  |  | 2 |
Physical options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  | 1 |  |  |  | Option model |  |  |  | Market price (per Dth)(3) |  |  |  | 2-7 |  |  |  | 3 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 26%-54% |  |  |  | 33 | %
Electricity |  |  | 43 |  |  |  | Option model |  |  |  | Market price (per MWh)(3) |  |  |  | 22-74 |  |  |  | 37 |
|  |  |  |  |  |  |  |  |  |  | Price volatility (4) |  |  |  | 13%-63% |  |  |  | 33 | %
Total assets |  |  | $152 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  |  | $ 5 |  |  |  | Discounted cash flow |  |  |  | Market price (per MWh)(3) |  |  |  | (4)-6 |  |  |  | — |
Total liabilities |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(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.
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) |
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, 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 |
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 $27 million and $26 million of assets at December 31, 2017 and 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.
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:
|  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | 143 |  |  | $ | 93 |  |  | $ | 102 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (43 | ) |  |  | (35 | ) |  |  | (13 | )
Included in regulatory assets/liabilities |  |  | 40 |  |  |  | (37 | ) |  |  | (5 | )
Settlements |  |  | 7 |  |  |  | 35 |  |  |  | 13 |
Purchases |  |  | — |  |  |  | 87 |  |  |  | — |
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | (4 | )
Balance at December 31, |  | $ | 147 |  |  | $ | 143 |  |  | $ | 93 |
The gains and losses included in earnings in the Level 3 fair value category were classified in electric fuel and other energy-related purchases expense in Virginia Power’s Consolidated Statements of Income for the years ended December 31, 2017, 2016 and 2015. There were no unrealized gains and losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date for the years ended December 31, 2017, 2016 and 2015. DOMINION ENERGY GAS The following table presents Dominion Energy Gas’ quantitative information about Level 3 fair value measurements at December 31, 2017. The range and weighted average are presented in dollars for market price inputs.
|  | Fair Value (millions) |  |  | Valuation Techniques |  |  | Unobservable Input |  |  | Range |  |  | Weighted Average(1) |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial forwards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NGLs |  |  | $2 |  |  |  | Discounted cash flow |  |  |  | Market price (per Dth) | (2) |  |  | 0 - 1 |  |  |  | 1 |
Total liabilities |  |  | $2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) | Averages weighted by volume.
(2) | Represents market prices beyond defined terms for Levels 1 and 2.
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) |
The following table presents Dominion Energy Gas’ assets and liabilities for commodity and foreign currency 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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency |  |  | $ — |  |  |  | $32 |  |  |  | $ — |  |  | $ | 32 |
Total assets |  |  | $ — |  |  |  | $32 |  |  |  | $ — |  |  | $ | 32 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  |  | $ — |  |  |  | $ 4 |  |  |  | $ 2 |  |  | $ | 6 |
Foreign currency |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total liabilities |  |  | $ — |  |  |  | $ 6 |  |  |  | $ 2 |  |  | $ | 8 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity |  |  | $ — |  |  |  | $ 3 |  |  |  | $ 2 |  |  | $ | 5 |
Foreign currency |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 6 |
Total liabilities |  |  | $ — |  |  |  | $ 9 |  |  |  | $ 2 |  |  | $ | 11 |
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:
|  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Balance at January 1, |  | $ | (2 | ) |  | $ | 6 |  |  | $ | 2 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | — |  |  |  | — |  |  |  | 1 |
Included in other comprehensive loss |  |  | (3 | ) |  |  | — |  |  |  | (5 | )
Settlements |  |  | — |  |  |  | — |  |  |  | (1 | )
Transfers out of Level 3 |  |  | 3 |  |  |  | (8 | ) |  |  | 9 |
Balance at December 31, |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | 6 |
The gains and losses included in earnings in the Level 3 fair value category were classified in operating revenue in Dominion Energy Gas’ Consolidated Statements of Income for the years ended December 31, 2017, 2016 and 2015. There were no unrealized gains and losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date for the years ended December 31, 2017, 2016 and 2015. Fair Value of Financial Instruments Substantially all of the Companies’ financial instruments are recorded at fair value, with the exception of the instruments described below, which are reported at historical cost. Estimated fair values have been determined using available market information and valuation methodologies considered appropriate by management. The carrying amount of cash and cash equivalents, restricted cash and equivalents, customer and other receivables, affiliated receivables, short-term debt, affiliated current borrowings, payables to affiliates and accounts payable are representative of fair value because of the short-term nature of these 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, |  | 2017 |  |  | 2016 |
|  | 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) |  | $ | 28,666 |  |  |  | $31,233 |  |  | $ | 26,587 |  |  |  | $28,273 |
Junior subordinated notes(3) |  |  | 3,981 |  |  |  | 4,102 |  |  |  | 2,980 |  |  |  | 2,893 |
Remarketable subordinated notes(3) |  |  | 1,379 |  |  |  | 1,446 |  |  |  | 2,373 |  |  |  | 2,418 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year(3) |  | $ | 11,346 |  |  |  | $12,842 |  |  | $ | 10,530 |  |  |  | $11,584 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, including securities due within one year(4) |  | $ | 3,570 |  |  |  | $ 3,719 |  |  | $ | 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 December 31, 2017, and 2016, includes the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt of $(22) 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.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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