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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Defined Benefit Plan [Abstract]  
Components of Net Periodic (Benefit Credit) Benefit Cost
The components of net periodic benefit credit included in our consolidated statements of income for the three months ended September 30, 2018 and 2017 are as follows:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 September 30
 
Three Months Ended 
 September 30
 
2018
 
2017
 
2018
 
2017
Service cost
$
2

 
$
2

 
$
—

 
$
—

Interest cost
14

 
17

 
4

 
5

Expected return on assets
(37
)
 
(37
)
 
(6
)
 
(6
)
Recognized actuarial loss
6

 
5

 
1

 
3

Settlement loss
6

 
3

 
—

 
—

Amortization of prior service credit
—

 
—

 
(3
)
 
(3
)
Net periodic benefit credit
$
(9
)
 
$
(10
)
 
$
(4
)
 
$
(1
)
The components of net periodic benefit credit included in our consolidated statements of income for the nine months ended September 30, 2018 and 2017 are as follows:
 
Pension Benefits
 
Other Benefits
 
Nine Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2018
 
2017
 
2018
 
2017
Service cost
$
6

 
$
7

 
$
1

 
$
1

Interest cost
41

 
50

 
11

 
15

Expected return on assets
(110
)
 
(111
)
 
(18
)
 
(17
)
Recognized actuarial loss
18

 
16

 
3

 
9

Settlement loss
19

 
7

 
—

 
—

Amortization of prior service credit
—

 
—

 
(9
)
 
(10
)
Net periodic benefit credit
$
(26
)
 
$
(31
)
 
$
(12
)
 
$
(2
)