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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contributions to qualified defined benefit pension plans and OPEB plans |  |  |  |  | $ 0 |  |  |
Voluntary Retirement Program |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | $ 423,000,000 |  |  |  |
Voluntary retirement program related charges net of tax |  |  |  | 316,000,000 |  |  |  |
Voluntary Retirement Program | Other Operations and Maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 247,000,000 |  |  |  |
Voluntary Retirement Program | Other Taxes |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 21,000,000 |  |  |  |
Voluntary Retirement Program | Other Income |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 111,000,000 |  |  |  |
Voluntary Retirement Program | Net Income Including Noncontrolling Interest From Discontinued Operations |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 44,000,000 |  |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 194,000,000 |  |  |  |
Voluntary retirement program related charges net of tax |  |  |  | 144,000,000 |  |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other Operations and Maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 186,000,000 |  |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other Taxes |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | $ 8,000,000 |  |  |  |
Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Service cost |  | $ 45,000,000 | $ 41,000,000 |  | 131,000,000 | $ 121,000,000 |  |
Remeasurement resulted in increase in pension benefit obligation |  | 497,000,000 |  |  |  |  |  |
Increase in fair value of plan assets |  | 87,000,000 |  |  |  |  |  |
Net periodic benefit (credit) cost |  | (10,000,000) | 5,000,000 |  | (28,000,000) | 87,000,000 |  |
Pension Benefits | Minimum |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  |  |  |  |  |  |  | 3.11%
Pension Benefits | Maximum |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  |  |  |  |  |  |  | 3.16%
Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Service cost |  | 8,000,000 | 7,000,000 |  | 22,000,000 | 20,000,000 |  |
Net periodic benefit (credit) cost |  | (27,000,000) | (24,000,000) |  | (83,000,000) | (22,000,000) |  |
Scenario Forecast |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Benefits to retirees expected charge | $ 25,000,000 |  |  |  |  |  |  |
Benefits to retirees expected charge after tax | 19,000,000 |  |  |  |  |  |  |
Scenario Forecast | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit (credit) cost |  |  |  |  |  |  | $ 4,000,000 |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 | $ 250,000,000 |  |  |  |  |  | 250,000,000 |
Scenario Forecast | Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contribution to voluntary employees beneficiary association |  |  |  |  |  |  | $ 0 |
Discontinued Operations |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Service cost |  | $ 3,000,000 | $ 4,000,000 |  | $ 12,000,000 | $ 12,000,000 |  |

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