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Employment Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Components of the net (benefit) cost for the periods presented below for certain employee benefit plans were as follows (in millions):
 
 
Pension Benefits
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Net (Benefit) Cost
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
7

 
$
12

 
$
24

 
$
34

Interest cost
 
20

 
20

 
62

 
62

Expected return on plan assets
 
(41
)
 
(39
)
 
(120
)
 
(118
)
Amortization of net gain
 
—

 
—

 
(1
)
 
—

Amortization of prior service credits
 
—

 
—

 
(3
)
 
—

Curtailment gain
 
—

 
—

 
(117
)
 
—

Net (benefit) cost recognized
 
$
(14
)
 
$
(7
)
 
$
(155
)
 
$
(22
)

 
 
Retiree Health and Welfare Benefits
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Net (Benefit) Cost
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
1

 
$
1

 
$
1

 
$
1

Interest cost
 
2

 
2

 
6

 
6

Amortization of prior service credits
 
—

 
(2
)
 
—

 
(2
)
Net (benefit) cost recognized
 
$
3

 
$
1

 
$
7

 
$
5



Service cost is included in compensation and benefits expense and the other components of net periodic benefit costs are included in other (income) expense, net in the Consolidated Statements of Income.