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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net Periodic Cost (Benefit)
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended June 30,
Six months ended June 30,
 
Three Months Ended June 30,
Six months ended June 30,
 
2019
2018
2019
2018
 
2019
2018
2019
2018
Service cost
$
1

$
1

$
2

$
2

 
$

$

$

$

Interest cost
40

36

79

71

 
2

1

4

3

Expected return on plan assets
(56
)
(59
)
(113
)
(115
)
 
(1
)
(1
)
(2
)
(3
)
Amortization of prior service credit




 
(2
)
(2
)
(3
)
(3
)
Amortization of actuarial loss
11

13

22

25

 
2

2

3

3

Net periodic cost (benefit)
$
(4
)
$
(9
)
$
(10
)
$
(17
)
 
$
1

$

$
2

$