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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 43 | $ 40 | $ 86 | $ 80
Interest cost |  | 90 | 98 | 181 | 199
Expected return on plan assets |  | (192) | (176) | (385) | (353)
Amortization of prior service cost (credit) |  | 1 | 1 | 1 | 1
Amortization of net actuarial loss |  | 48 | 43 | 97 | 82
Settlement and curtailment | [1] | 2 | 71 | 2 | 73
Net periodic benefit cost (credit) |  | (8) | 77 | (18) | 82
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 2 | 4 | 3 | 8
Interest cost |  | 2 | 8 | 5 | 16
Expected return on plan assets |  | (14) | (39) | (28) | (78)
Amortization of prior service cost (credit) |  | 0 | 0 | 0 | 0
Amortization of net actuarial loss |  | 2 | 5 | 4 | 10
Settlement and curtailment | [2] | 0 | 1 | 0 | 1
Net periodic benefit cost (credit) |  | (8) | (21) | (16) | (43)
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 7 | 6 | 14 | 13
Interest cost |  | 15 | 17 | 30 | 34
Expected return on plan assets |  | (39) | (35) | (78) | (68)
Amortization of prior service cost (credit) |  | (13) | (13) | (25) | (26)
Amortization of net actuarial loss |  | 2 | 3 | 3 | 7
Settlement and curtailment | [1] | 0 | 42 | 0 | 42
Net periodic benefit cost (credit) |  | (28) | 20 | (56) | 2
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 0 | 1 | 1 | 2
Interest cost |  | 1 | 2 | 2 | 5
Expected return on plan assets |  | (5) | (7) | (10) | (14)
Amortization of prior service cost (credit) |  | (1) | (1) | (2) | (2)
Amortization of net actuarial loss |  | 1 | 1 | 1 | 2
Settlement and curtailment | [2] | 0 | 1 | 0 | 1
Net periodic benefit cost (credit) |  | $ (4) | $ (3) | $ (8) | $ (6)
[1] | 2019 amounts relate primarily to a voluntary retirement program.
[2] | 2019 amounts relate to a voluntary retirement program.

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