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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 41 | $ 39 | $ 121 | $ 118
Interest cost |  | 97 | 85 | 296 | 253
Expected return on plan assets |  | (177) | (165) | (530) | (498)
Amortization of prior service cost (credit) |  |  |  | 1 | 1
Amortization of net actuarial loss |  | 42 | 48 | 124 | 145
Settlements and curtailment | [1] | 2 |  | 75 | 0
Net periodic benefit cost (credit) |  | 5 | 7 | 87 | 19
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 4 | 4 | 12 | 13
Interest cost |  | 7 | 7 | 23 | 21
Expected return on plan assets |  | (38) | (36) | (116) | (111)
Amortization of prior service cost (credit) |  | 0 | 0 | 0 | 0
Amortization of net actuarial loss |  | 5 | 4 | 15 | 14
Settlements and curtailment | [2] |  |  | 1 | 0
Net periodic benefit cost (credit) |  | (22) | (21) | (65) | (63)
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 7 | 7 | 20 | 20
Interest cost |  | 17 | 14 | 51 | 42
Expected return on plan assets |  | (37) | (36) | (105) | (107)
Amortization of prior service cost (credit) |  | (13) | (13) | (39) | (39)
Amortization of net actuarial loss |  | 2 | 3 | 9 | 8
Settlements and curtailment | [1] |  |  | 42 | 0
Net periodic benefit cost (credit) |  | (24) | (25) | (22) | (76)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  |  | 1 | 2 | 3
Interest cost |  | 3 | 3 | 8 | 8
Expected return on plan assets |  | (6) | (7) | (20) | (21)
Amortization of prior service cost (credit) |  | (1) | (1) | (3) | (3)
Amortization of net actuarial loss |  | 0 | 0 | 2 | 2
Settlements and curtailment | [2] |  |  | 1 | 0
Net periodic benefit cost (credit) |  | $ (4) | $ (4) | $ (10) | $ (11)
[1] | Primarily related to a voluntary retirement program.
[2] | Related to a voluntary retirement program.

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