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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | Note 20. Employee Benefit Plans Dominion Energy The components of Dominion Energy’s provision for net periodic benefit cost (credit) were as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 40 |  |  | $ | 39 |  |  | $ | 7 |  |  | $ | 7 |
Interest cost |  |  | 101 |  |  |  | 84 |  |  |  | 17 |  |  |  | 14 |
Expected return on plan assets |  |  | (177 | ) |  |  | (165 | ) |  |  | (33 | ) |  |  | (36 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (13 | ) |  |  | (13 | )
Amortization of net actuarial loss |  |  | 39 |  |  |  | 48 |  |  |  | 4 |  |  |  | 3 |
Settlements |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 5 |  |  | $ | 6 |  |  | $ | (18 | ) |  | $ | (25 | )
Voluntary Retirement Program In March 2019, the Companies announced a voluntary retirement program to employees that meet certain age and service requirements. The Companies expect to incur a charge in the second quarter of 2019 as determinations are made concerning the number of employees that elect to participate in the program. The voluntary retirement program will not compromise safety or the Companies’ ability to comply with applicable laws and regulations. While the Companies are unable to estimate the amount, it could be material to the Companies’ results of operations and financial condition. Employer Contributions During the three months ended March 31, 2019, Dominion Energy made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy expects to contribute approximately $21 million and $12 million to its defined benefit pension plans and other postretirement benefit plans through VEBAs, respectively, during the remainder of 2019. Dominion Energy Gas Dominion Energy Gas participates in certain Dominion Energy benefit plans as described in Note 21 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2018. See Note 19 for more information. The components of Dominion Energy Gas’ provision for net periodic benefit cost (credit) for employees represented by collective bargaining units were as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 8 |  |  |  | 7 |  |  |  | 3 |  |  |  | 3 |
Expected return on plan assets |  |  | (39 | ) |  |  | (37 | ) |  |  | (7 | ) |  |  | (8 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Amortization of net actuarial loss |  |  | 5 |  |  |  | 5 |  |  |  | 1 |  |  |  | 1 |
Net periodic benefit credit |  | $ | (22 | ) |  | $ | (21 | ) |  | $ | (3 | ) |  | $ | (4 | )
Employer Contributions During the three months ended March 31, 2019, Dominion Energy Gas made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy Gas expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs during the remainder of 2019.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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