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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
Dominion
The components of Dominion's provision for net periodic benefit cost (credit) were as follows:
 
Pension Benefits
Other Postretirement Benefits
 
2015
2014
2015
2014
(millions)
 
 
 
 
Three Months Ended September 30,
 
 
 
 
Service cost
$
32

$
29

$
10

$
7

Interest cost
71

73

17

17

Expected return on plan assets
(132
)
(126
)
(29
)
(28
)
Amortization of prior service credit
—

—

(7
)
(7
)
Amortization of net actuarial loss
40

28

1

1

Settlements and curtailments
—

1

—

—

Net periodic benefit cost (credit)
$
11

$
5

$
(8
)
$
(10
)
Nine Months Ended September 30,
 
 
 
 
Service cost
$
95

$
86

$
30

$
23

Interest cost
215

218

50

50

Expected return on plan assets
(398
)
(376
)
(88
)
(83
)
Amortization of prior service cost (credit)
1

2

(20
)
(21
)
Amortization of net actuarial loss
120

84

4

2

Settlements and curtailments
—

1

—

—

Net periodic benefit cost (credit)
$
33

$
15

$
(24
)
$
(29
)


Employer Contributions
During the nine months ended September 30, 2015, Dominion made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs during the remainder of 2015.

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, 2014. At September 30, 2015 and December 31, 2014, Dominion Gas’ amounts due from Dominion associated with the Dominion Pension Plan and reflected in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $642 million and $614 million, respectively. At September 30, 2015 and December 31, 2014, Dominion Gas’ amounts due to Dominion associated with the Dominion Retiree Health and Welfare Plan and reflected in other deferred credits and other liabilities in the Consolidated Balance Sheets were $4 million and $7 million, respectively.

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
 
2015

2014

2015

2014

(millions)
 
 
 
 
Three Months Ended September 30,
 
 
 
 
Service cost
$
4

$
3

$
2

$
1

Interest cost
7

7

3

4

Expected return on plan assets
(31
)
(29
)
(6
)
(6
)
Amortization of prior service cost
—

1

—

—

Amortization of net actuarial loss
5

5

1

—

Net periodic benefit credit
$
(15
)
$
(13
)
$
—

$
(1
)
Nine Months Ended September 30,
 
 
 
 
Service cost
$
11

$
9

$
5

$
4

Interest cost
21

21

10

10

Expected return on plan assets
(94
)
(86
)
(18
)
(17
)
Amortization of prior service cost (credit)
—

1

—

(1
)
Amortization of net actuarial loss
15

14

2

—

Net periodic benefit credit
$
(47
)
$
(41
)
$
(1
)
$
(4
)


Employer Contributions
During the nine months ended September 30, 2015, 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 2015.