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Employee Benefit Plans (Narrative) (Detail) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation |  | $ 10,600,000,000 | $ 9,700,000,000 | $ 10,600,000,000 |  |  |  |  | $ 10,600,000,000 | $ 9,700,000,000 |
Contributions to qualified defined benefit pension plans |  |  |  |  |  |  |  |  |  | $ 499,000,000 |
Contributions to qualified defined benefit pension plans, shares |  |  |  |  |  |  |  |  |  | 6.1 |
Contributions to qualified defined benefit pension plans in 2021 |  | $ 17,000,000 |  | $ 17,000,000 |  |  |  |  | 17,000,000 |  |
Defined contribution plan, employer matching contributions |  |  |  |  |  |  |  |  | 67,000,000 | $ 69,000,000 | $ 46,000,000
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  | $ 13,000,000 | 16,000,000 | 18,000,000
Common and Preferred Stocks |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 28.00% |  | 28.00% |  |  |  |  | 28.00% |  |
Non-U.S. Equity |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 18.00% |  | 18.00% |  |  |  |  | 18.00% |  |
Fixed Income Funds |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 35.00% |  | 35.00% |  |  |  |  | 35.00% |  |
Real Estate Funds |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 3.00% |  | 3.00% |  |  |  |  | 3.00% |  |
Other than Securities Investment |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 16.00% |  | 16.00% |  |  |  |  | 16.00% |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contributions to qualified defined benefit pension plans |  |  |  |  |  |  |  |  |  | 499,000,000 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts due to Dominion |  | $ 266,000,000 | 210,000,000 | $ 266,000,000 |  |  |  |  | $ 266,000,000 | 210,000,000 |
Defined contribution plan, employer matching contributions |  |  |  |  |  |  |  |  | 19,000,000 | 20,000,000 | 20,000,000
Pension Plans and Post Retirement Benefit Plan |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | 1,900,000,000 | 2,100,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | 933,000,000 | 848,000,000 |
Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | 1,602,000,000 | 1,747,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | 777,000,000 | 708,000,000 | 663,000,000
Increase (decrease) in fair value of plan assets |  |  |  |  |  | $ 51,000,000 | $ 671,000,000 |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  |  |  |  |  | (32,000,000) | 93,000,000 | 25,000,000
Actuarial losses from decrease in discount rate |  |  |  |  |  |  |  |  | (1,000,000,000.0) | (1,100,000,000) |
Contributions to qualified defined benefit pension plans |  | 250,000,000 | $ 520,000,000 |  |  |  |  |  | 278,000,000 | 557,000,000 |
Service cost |  |  |  |  |  |  |  |  | 173,000,000 | 162,000,000 | 157,000,000
Pension Benefits | Virginia Electric and Power Company | Amounts Associated With Dominion Pension Plan |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment made to Dominion |  |  |  |  |  |  |  |  | 313,000,000 |  |
Amounts due to Dominion |  | $ 151,000,000 |  | $ 151,000,000 |  |  |  |  | 151,000,000 |  |
Pension Benefits | Virginia Electric and Power Company | Other Operations and Maintenance |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  |  |  |  |  | $ 118,000,000 | $ 152,000,000 | 126,000,000
Pension Benefits | Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 2.73% | 3.47% | 2.73% |  |  | 4.07% |  | 2.73% | 3.47% |
Pension Benefits | Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 2.95% | 3.63% | 2.95% |  |  | 4.10% |  | 2.95% | 3.63% |
Pension Benefits | BHE |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remeasurement resulted in increase in pension benefit obligation |  |  |  |  | $ 497,000,000 |  |  |  |  |  |
Increase (decrease) in fair value of plan assets |  |  |  |  | $ (87,000,000) |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  |  |  |  |  | $ (4,000,000) |  |
Pension Benefits | BHE | Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.11% |  | 3.11% |  |  |  |  | 3.11% |  |
Pension Benefits | BHE | Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.16% |  | 3.16% |  |  |  |  | 3.16% |  |
Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | $ 300,000,000 | $ 349,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  |  |  |  | 156,000,000 | 140,000,000 | 143,000,000
Increase (decrease) in fair value of plan assets |  |  |  |  |  |  | $ 156,000,000 |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  |  |  |  |  | $ (172,000,000) | $ (46,000,000) | $ (101,000,000)
Health care cost trend rate | [1] | 6.25% |  | 6.25% |  |  |  |  | 6.25% |  | 7.00%
Health care cost trend decreased rate | [1] | 5.00% | 5.00% | 5.00% |  |  |  |  | 5.00% | 5.00% | 5.00%
Actuarial losses from decrease in discount rate |  |  |  |  |  |  |  |  | $ (149,000,000) | $ (168,000,000) |
Actuarial gain from completed experience study and update to healthcare claim assumptions |  |  |  |  |  |  |  |  | 85,000,000 | 55,000,000 |
Contributions to qualified defined benefit pension plans |  |  |  |  |  |  |  |  | 13,000,000 | 12,000,000 |
Contribution to voluntary employees beneficiary association |  |  |  |  |  |  |  |  | 0 |  |
Service cost |  |  |  |  |  |  |  |  | 28,000,000 | 26,000,000 | $ 27,000,000
Other Postretirement Benefits | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution to voluntary employees beneficiary association |  |  |  |  |  |  |  |  | 0 | 0 |
Other Postretirement Benefits | Virginia Electric and Power Company | Forecast |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution to voluntary employees beneficiary association |  |  |  |  |  |  |  | $ 0 |  |  |
Other Postretirement Benefits | Virginia Electric and Power Company | Other Operations and Maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  |  |  |  |  | $ (58,000,000) | $ (27,000,000) | $ (51,000,000)
Other Postretirement Benefits | Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 2.69% | 3.44% | 2.69% |  |  | 4.05% |  | 2.69% | 3.44% |
Health care cost trend rate | [1] |  | 6.50% |  |  |  |  |  |  | 6.50% |
Other Postretirement Benefits | Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 2.80% | 3.52% | 2.80% |  |  | 4.08% |  | 2.80% | 3.52% |
Health care cost trend rate | [1] |  | 6.60% |  |  |  |  |  |  | 6.60% |
Other Postretirement Benefits | BHE |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value of plan assets |  |  |  | $ (25,000,000) |  |  |  |  |  |  |
Increase in accumulated postretirement benefit obligation |  |  |  | $ 16,000,000 |  |  |  |  |  |  |
Health care cost trend rate |  | 6.25% |  | 6.25% |  |  |  |  | 6.25% |  |
Health care cost trend decreased rate |  | 5.00% |  | 5.00% |  |  |  |  | 5.00% |  |
Other Postretirement Benefits | BHE | Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.07% |  | 3.07% |  |  |  |  | 3.07% |  |
Other Postretirement Benefits | BHE | Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.11% |  | 3.11% |  |  |  |  | 3.11% |  |
Voluntary Retirement Program |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remeasurement resulted in increase in pension benefit obligation |  |  |  |  |  | $ 37,000,000 | $ 484,000,000 |  |  |  |
Discount rate percentage |  |  |  |  |  | 3.57% |  |  |  |  |
Increase in accumulated postretirement benefit obligation |  |  |  |  |  |  | $ 101,000,000 |  |  |  |
Voluntary retirement program related charges |  |  |  |  |  |  |  |  |  | $ 427,000,000 |
Voluntary retirement program related charges net of tax |  |  |  |  |  |  |  |  |  | 319,000,000 |
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 |  |  |  |  |  |  |  |  |  | 251,000,000 |
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 |  |  |  |  |  |  |  |  |  | 198,000,000 |
Voluntary retirement program related charges net of tax |  |  |  |  |  |  |  |  |  | 146,000,000 |
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 |  |  |  |  |  |  |  |  |  | 190,000,000 |
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 |
[1] | Assumptions used to determine net periodic cost for the following year.

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