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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
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 March 31,
 
 
 
 
Service cost
$
32

$
29

$
10

$
8

Interest cost
72

72

17

17

Expected return on plan assets
(133
)
(125
)
(29
)
(28
)
Amortization of prior service cost (credit)
—

1

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

28

1

—

Net periodic benefit cost (credit)
$
11

$
5

$
(8
)
$
(10
)
Dominion Gas Holdings, LLC  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
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 March 31,
 
 
 
 
Service cost
$
3

$
3

$
2

$
1

Interest cost
7

7

3

3

Expected return on plan assets
(31
)
(29
)
(6
)
(5
)
Amortization of net actuarial loss
5

5

1

—

Net periodic benefit credit
$
(16
)
$
(14
)
$
—

$
(1
)