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Retirement and Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Retirement and Postretirement Benefit Plans
Retirement and Postretirement Benefit Plans

The following table sets forth the components of the net periodic benefit costs for Occidental’s defined benefit plans for the three months ended March 31, 2019, and 2018 (in millions):
Three months ended March 31
 
2019
 
2018
Net Periodic Benefit Costs
 
Pension Benefit
 
Postretirement Benefit
 
Pension Benefit
 
Postretirement Benefit
 
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
6

 
$
2

 
$
6

Interest cost
 
4

 
8

 
4

 
9

Expected return on plan assets
 
(5
)
 
—

 
(6
)
 
—

Recognized actuarial loss
 
2

 
2

 
1

 
4

Recognized prior service cost
 
—

 
(2
)
 
—

 
—

Total
 
$
2

 
$
14

 
$
1

 
$
19



Occidental contributed approximately $1 million to the defined benefit pension plans in the three months ended March 31, 2019, and 2018.