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Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2022 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | $ 1,350 |  | $ 2,176
Fair Value of Derivative Liabilities |  | 697 |  | 1,404
Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 298 |  | 882
Fair Value of Derivative Liabilities |  | 316 |  | 456
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 7,865 |  | 7,782
Total liabilities |  | 697 |  | 1,404
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 3,770 |  | 3,902
Total liabilities |  | 316 |  | 456
Fair Value, Measurements, Recurring | Commodity Contract |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 550 |  | 769
Fair Value of Derivative Liabilities |  | 299 |  | 926
Fair Value, Measurements, Recurring | Commodity Contract | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 117 |  | 268
Fair Value of Derivative Liabilities |  | 232 |  | 348
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 225 | [1] | 437
Total liabilities |  | 139 | [1] | 15
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 21 | [1] | 236
Total liabilities |  | 137 | [1] | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity Contract |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 225 |  | 437
Fair Value of Derivative Liabilities |  | 139 |  | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity Contract | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 21 |  | 236
Fair Value of Derivative Liabilities |  | 137 |  | $ 15
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [1],[2] | 14 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [1],[2] | $ 14 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 3 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 3 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Weighted Average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Natural Gas | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2],[3] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | 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 | [1],[2],[3] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | $ 3 |  |
Fair Value of Derivative Liabilities | [1] | 123 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | 3 |  |
Fair Value of Derivative Liabilities | [1] | $ 123 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 1 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 1 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Weighted Average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1],[3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1],[3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | FTRs | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1],[3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | $ 152 |  |
Fair Value of Derivative Liabilities | [1] | $ 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 27 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 40 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 121 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 127 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Weighted Average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[3] | 47 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity Contract | Electricity | Weighted Average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[3] | 62 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1],[2] | $ 70 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1],[2] | $ 18 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 1 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 1 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 3.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 11.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 76.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 64.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Weighted Average | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [3],[4] | 45.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Weighted Average | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [3],[4] | 53.00% |  |
[1] | Represents market prices beyond defined terms for Levels 1 and 2.
[2] | Includes basis.
[3] | Averages weighted by volume.
[4] | Represents volatilities unrepresented in published markets.

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