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Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Changes in fair value of plan assets: |  |  |  |  |  |  |
Employer contributions |  |  |  |  | $ 499 |  |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | $ 1,704 | $ 1,707 | $ 1,704 | 1,707 |  |
Noncurrent pension and other postretirement benefit liabilities |  | (1,706) | (2,364) | (1,706) | (2,364) |  |
Pension Benefits |  |  |  |  |  |  |
Changes in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  | 10,446 | 8,500 |  |
Dominion Energy SCANA Combination |  |  |  |  | 854 |  |
Service cost |  |  |  | 173 | 162 | $ 157 |
Interest cost |  |  |  | 351 | 394 | 337 |
Benefits paid |  |  |  | (461) | (470) |  |
Actuarial (gains) losses during the year |  |  |  | 992 | 1,054 |  |
Settlements, curtailments and special termination benefits | [1] |  |  | (138) | (48) |  |
Benefit obligation at end of year |  | 11,363 | 10,446 | 11,363 | 10,446 | 8,500 |
Changes in fair value of plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  | 9,631 | 7,197 |  |
Dominion Energy SCANA Combination |  |  |  |  | 727 |  |
Actual return (loss) on plan assets |  |  |  | 1,602 | 1,747 |  |
Employer contributions |  | 250 | 520 | 278 | 557 |  |
Benefits paid |  |  |  | (461) | (470) |  |
Settlements | [2] |  |  | (71) | (127) |  |
Fair value of plan assets at end of year |  | 10,979 | 9,631 | 10,979 | 9,631 | 7,197 |
Funded status at end of year |  | (384) | (815) | (384) | (815) |  |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | 1,054 | 1,266 | 1,054 | 1,266 |  |
Other current liabilities |  | (14) | (29) | (14) | (29) |  |
Noncurrent pension and other postretirement benefit liabilities |  | (1,424) | (2,052) | (1,424) | (2,052) |  |
Net amount recognized |  | $ (384) | $ (815) | $ (384) | $ (815) |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |
Weighted average rate of increase for compensation |  | 4.53% | 4.23% | 4.53% | 4.23% |  |
Pension Benefits | Minimum |  |  |  |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |
Discount rate |  | 2.73% | 3.47% | 2.73% | 3.47% |  | 4.07%
Crediting interest rate for cash balance and similar plans |  | 1.93% | 2.67% | 1.93% | 2.67% |  |
Crediting interest rate for cash balance and similar plans |  | 1.93% | 2.67% | 1.93% | 2.67% |  |
Pension Benefits | Maximum |  |  |  |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |
Discount rate |  | 2.95% | 3.63% | 2.95% | 3.63% |  | 4.10%
Crediting interest rate for cash balance and similar plans |  | 2.15% | 2.83% | 2.15% | 2.83% |  |
Crediting interest rate for cash balance and similar plans |  | 2.15% | 2.83% | 2.15% | 2.83% |  |
Other Postretirement Benefits |  |  |  |  |  |  |
Changes in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  | $ 1,769 | $ 1,363 |  |
Dominion Energy SCANA Combination |  |  |  |  | 253 |  |
Service cost |  |  |  | 28 | 26 | 27 |
Interest cost |  |  |  | 58 | 68 | 56 |
Benefits paid |  |  |  | (120) | (96) |  |
Actuarial (gains) losses during the year |  |  |  | 33 | 111 |  |
Plan amendments |  |  |  | (6) |  |  |
Settlements, curtailments and special termination benefits | [1] |  |  | (16) | 44 |  |
Benefit obligation at end of year |  | $ 1,746 | $ 1,769 | 1,746 | 1,769 | 1,363 |
Changes in fair value of plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  | 1,880 | 1,581 |  |
Actual return (loss) on plan assets |  |  |  | 300 | 349 |  |
Employer contributions |  |  |  | 13 | 12 |  |
Benefits paid |  |  |  | (93) | (62) |  |
Fair value of plan assets at end of year |  | 2,100 | 1,880 | 2,100 | 1,880 | $ 1,581 |
Funded status at end of year |  | 354 | 111 | 354 | 111 |  |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | 650 | 442 | 650 | 442 |  |
Other current liabilities |  | (15) | (17) | (15) | (17) |  |
Noncurrent pension and other postretirement benefit liabilities |  | (281) | (314) | (281) | (314) |  |
Net amount recognized |  | $ 354 | $ 111 | $ 354 | $ 111 |  |
Other Postretirement Benefits | Minimum |  |  |  |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |
Discount rate |  | 2.69% | 3.44% | 2.69% | 3.44% |  | 4.05%
Other Postretirement Benefits | Maximum |  |  |  |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |
Discount rate |  | 2.80% | 3.52% | 2.80% | 3.52% |  | 4.08%
[1] | 2020 amounts include curtailments and settlements recognized as a result of the GT&S Transaction as well as settlements of qualified and nonqualified pension obligations. 2019 amounts relate primarily to a curtailment and settlement as a result of the voluntary retirement program.
[2] | 2020 amounts relate primarily to settlements of qualified and nonqualified pension obligations. 2019 amounts relate primarily to a settlement as a result of the voluntary retirement program.

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