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Employment Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]  
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 June 30,
Net (Benefit) Cost
 
2019
 
2018
Service cost
 
$
7

 
$
11

Interest cost
 
20

 
21

Expected return on plan assets
 
(40
)
 
(39
)
Net (benefit) cost recognized
 
$
(13
)
 
$
(7
)
 
 
Pension Benefits
 
 
Six Months Ended June 30,
Net (Benefit) Cost
 
2019
 
2018
Service cost
 
$
17

 
$
22

Interest cost
 
42

 
42

Expected return on plan assets
 
(79
)
 
(79
)
Amortization of net gain
 
(1
)
 
—

Amortization of prior service credits
 
(3
)
 
—

Curtailment gain
 
(117
)
 
—

Net (benefit) cost recognized
 
$
(141
)
 
$
(15
)

 
 
Retiree Health and Welfare Benefits
 
 
Three Months Ended June 30,
Net (Benefit) Cost
 
2019
 
2018
Interest cost
 
$
2

 
$
2

Net (benefit) cost recognized
 
$
2

 
$
2


 
 
Retiree Health and Welfare Benefits
 
 
Six Months Ended June 30,
Net (Benefit) Cost
 
2019
 
2018
Interest cost
 
$
4

 
$
4

Net (benefit) cost recognized
 
$
4

 
$
4



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.