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Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2021 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | $ 2,176 |  | $ 613
Fair Value of Derivative Liabilities |  | 1,404 |  | 868
Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 882 |  | 300
Fair Value of Derivative Liabilities |  | $ 456 |  | 470
Commodity | Natural Gas | Maximum | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1] | 63.00% |  |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | $ 7,782 |  | 8,161
Total liabilities |  | 1,404 |  | 868
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 3,902 |  | 3,847
Total liabilities |  | 456 |  | 470
Fair Value, Measurements, Recurring | Commodity |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 769 |  | 282
Fair Value of Derivative Liabilities |  | 926 |  | 469
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 268 |  | 146
Fair Value of Derivative Liabilities |  | 348 |  | 133
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 437 | [2] | 230
Total liabilities |  | 15 | [2] | 8
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 236 | [2] | 110
Total liabilities |  | 15 | [2] | 8
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 437 |  | 230
Fair Value of Derivative Liabilities |  | 15 |  | 8
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 236 |  | 110
Fair Value of Derivative Liabilities |  | 15 |  | $ 8
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [2],[3] | 10 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [2],[3] | $ 10 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3],[4] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3],[4] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [2] | $ 214 |  |
Fair Value of Derivative Liabilities | [2] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [2] | 214 |  |
Fair Value of Derivative Liabilities | [2] | $ 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 24 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 24 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 12 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 12 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2],[4] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2],[4] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2],[4] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2],[4] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [2] | $ 201 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 27 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2] | 110 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [2],[4] | 51 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [2],[3] | $ 22 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [2],[3] | $ 22 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 3 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 3 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1] | 11.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 16 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3] | 16 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1] | 63.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3],[4] | 10 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [2],[3],[4] | 10 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Derivative Financial Instruments, Liabilities | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1],[4] | 45.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Physical Options | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1] | 11.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Physical Options | Natural Gas | Weighted Average | Derivative Financial Instruments, Liabilities | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [1],[4] | 45.00% |  |
[1] | Represents volatilities unrepresented in published markets.
[2] | Represents market prices beyond defined terms for Levels 1 and 2.
[3] | Includes basis.
[4] | Averages weighted by volume.

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