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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans In the first quarter of 2016, the Companies announced an organizational design initiative that reduced their total workforces during 2016. The goal of the organizational design initiative was to streamline leadership structure and push decision making lower while also improving efficiency. In the first quarter of 2016, Dominion recorded a $70 million ($43 million after-tax) charge, including $40 million ($25 million after-tax) at Virginia Power and $8 million ($5 million after-tax) at Dominion Gas, primarily reflected in other operations and maintenance expense in their Consolidated Statements of Income due to severance pay and other costs related to the organizational design initiative. The terms of the severance under the organizational design initiative were consistent with the Companies’ existing severance plans. Plan Amendment and Remeasurement In the first quarter of 2017, Dominion and Dominion Gas remeasured an other postretirement benefit plan as a result of an amendment that changed post-65 retiree medical coverage for certain current and future Local 69 retirees effective July 1, 2017. The remeasurement resulted in a decrease in Dominion's and Dominion Gas' accumulated postretirement benefit obligation of $73 million and $61 million, respectively. As a result of regulatory accounting, the remeasurement will have an immaterial impact on net income for both Dominion and Dominion Gas. The discount rate used for the remeasurement was 4.30%. All other assumptions used were consistent with the measurement as of December 31, 2016. In the first quarter of 2017, Dominion recorded a $7 million ($4 million after-tax) charge, including $6 million ($4 million after-tax) at Dominion Gas, as a result of additional payments associated with the new collective bargaining agreement, which is reflected in other operations and maintenance expense in their Consolidated Statements of Income. Dominion The components of Dominion's provision for net periodic benefit cost (credit) were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2017 | 2016 | 2017 | 2016
(millions) |  |  |  |
Three Months Ended March 31, |  |  |  |
Service cost | $ | 35 |  | $ | 29 |  | $ | 7 |  | $ | 8 |
Interest cost | 86 |  | 77 |  | 16 |  | 17 |
Expected return on plan assets | (159 | ) | (139 | ) | (32 | ) | (29 | )
Amortization of prior service credit | — |  | — |  | (12 | ) | (7 | )
Amortization of net actuarial loss | 40 |  | 28 |  | 3 |  | 1 |
Settlements | 1 |  | — |  | — |  | — |
Net periodic benefit cost (credit) | $ | 3 |  | $ | (5 | ) | $ | (18 | ) | $ | (10 | )
Employer Contributions During the three months ended March 31, 2017, Dominion made no contributions to its defined benefit pension plans or other postretirement benefit plans, except for a $75 million contribution made in January 2017 to Dominion Questar’s qualified pension plan to satisfy a regulatory condition to closing of the Dominion Questar Combination. Dominion expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs during the remainder of 2017. Dominion Gas Dominion Gas participates in certain Dominion 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, 2016. See Note 17 for more information. The components of Dominion Gas' provision for net periodic benefit credit for employees represented by collective bargaining units were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2017 | 2016 | 2017 | 2016
(millions) |  |  |  |
Three Months Ended March 31, |  |  |  |
Service cost | $ | 4 |  | $ | 3 |  | $ | 1 |  | $ | 1 |
Interest cost | 7 |  | 8 |  | 3 |  | 3 |
Expected return on plan assets | (35 | ) | (33 | ) | (6 | ) | (5 | )
Amortization of net actuarial loss | 4 |  | 3 |  | 1 |  | — |
Net periodic benefit credit | $ | (20 | ) | $ | (19 | ) | $ | (1 | ) | $ | (1 | )
Employer Contributions During the three months ended March 31, 2017, Dominion Gas made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Gas expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs, for both employees represented by collective bargaining units and employees not represented by collective bargaining units, during the remainder of 2017.

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