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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
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
 
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
)
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
 
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
)