XML 74 R52.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / MWh
$ / MMBTU
Dec. 31, 2016
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 274 $ 279
Fair Value of Derivative Liabilities 150 155
Virginia Electric and Power Company    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 178 194
Fair Value of Derivative Liabilities 33 31
Dominion Gas Holdings, LLC    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Liabilities 7 11
Level 3 | Virginia Electric and Power Company    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 140  
Fair Value, Measurements, Recurring | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 254 262
Fair Value of Derivative Liabilities 85 96
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 170 188
Fair Value of Derivative Liabilities 11 10
Fair Value, Measurements, Recurring | Dominion Gas Holdings, LLC | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Liabilities 1 5
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 141  
Fair Value of Derivative Liabilities 11  
Fair Value, Measurements, Recurring | Level 3 | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 141 147
Fair Value of Derivative Liabilities 11 8
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets [1] 78  
Fair Value of Derivative Liabilities [1] $ 2  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Liabilities | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] (1)  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Liabilities | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 4  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Liabilities | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2],[3] 3  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] (2)  
Credit Spreads (percentage) [4] 0.00%  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 7  
Credit Spreads (percentage) [4] 4.00%  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2],[3] 0  
Credit Spreads (percentage) [3],[5] 2.00%  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 1  
Fair Value of Derivative Liabilities $ 8  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2] (3)  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2] 2  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2],[3] 0  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2] (3)  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2] 3  
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2],[3] 0  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical and financial options:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 2  
Fair Value of Derivative Liabilities $ 1  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Liabilities | Physical and financial options: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 2  
Price volatility (percentage) [6] 34.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Liabilities | Physical and financial options: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 3  
Price volatility (percentage) [6] 48.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Liabilities | Physical and financial options: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2],[3] 3  
Price volatility (percentage) [3],[6] 39.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Assets | Physical and financial options: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 2  
Price volatility (percentage) [6] 18.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Assets | Physical and financial options: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2] 7  
Price volatility (percentage) [6] 48.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Assets | Physical and financial options: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [2],[3] 3  
Price volatility (percentage) [3],[6] 25.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 60  
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Assets | Electricity | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] 21  
Price volatility (percentage) [8] 14.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Assets | Electricity | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] 54  
Price volatility (percentage) [8] 68.00%  
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Assets | Electricity | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [2],[3] 33  
Price volatility (percentage) [3],[6] 31.00%  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Liabilities $ 8  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets 140 145
Fair Value of Derivative Liabilities 8 2
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | Natural Gas | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets [9] $ 77  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7] (2)  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7] 7  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | Natural Gas | Assets | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7],[10] 0  
Credit Spreads (percentage) [4],[10] 2.00%  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 1  
Fair Value of Derivative Liabilities $ 8  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] (3)  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] 2  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Liabilities | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7],[10] 0  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] (3)  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7] 2  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Discounted cash flow | FTRs | Assets | Physical and financial forwards and futures: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7],[10] 0  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Natural Gas | Physical and financial options:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 2  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Natural Gas | Assets | Physical and financial options: | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7] 2  
Price volatility (percentage) [8] 18.00%  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Natural Gas | Assets | Physical and financial options: | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7] 7  
Price volatility (percentage) [8] 40.00%  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Natural Gas | Assets | Physical and financial options: | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MMBTU [7],[10] 3  
Price volatility (percentage) [8],[10] 25.00%  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Electricity | Electricity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Assets $ 60  
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Option model | Electricity | Assets | Electricity | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Market price (per Dth, per MWh) | $ / MWh [7],[10] 33  
Price volatility (percentage) [8],[10] 31.00%  
Fair Value, Measurements, Recurring | Level 3 | Dominion Gas Holdings, LLC | Physical and financial forwards and futures:    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of Derivative Liabilities $ 0 $ 2
[1] Includes basis.
[2] Represents market prices beyond defined terms for Levels 1 and 2.
[3] Averages weighted by volume.
[4] Represents credit spreads unrepresented in published markets.
[5] Represents credit spreads unrepresented in published markets.
[6] Represents volatilities unrepresented in published markets.
[7] Represents market prices beyond defined terms for Levels 1 and 2.
[8] Represents volatilities unrepresented in published markets.
[9] Includes basis.
[10] Averages weighted by volume.