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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

Pension and Postretirement Plans
The components of net periodic benefit cost for the three and six months ended June 30, 2016 and 2015, were as follows:
 
Millions of Dollars
 
Pension Benefits
 
Other Benefits
 
2016
 
2015
 
2016

 
2015

 
U.S.

 
Int’l.

 
U.S.

 
Int’l.

 
 
 
 
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
32

 
9

 
31

 
10

 
2

 
2

Interest cost
29

 
8

 
27

 
7

 
2

 
2

Expected return on plan assets
(32
)
 
(10
)
 
(35
)
 
(9
)
 
—

 
—

Amortization of prior service cost (credit)
—

 
(1
)
 
1

 
(1
)
 
(1
)
 
(1
)
Recognized net actuarial loss (gain)
18

 
3

 
18

 
4

 
—

 
(1
)
Settlements
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
47


9


42


11


3


2

 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
64

 
18

 
62

 
20

 
4

 
4

Interest cost
58

 
15

 
54

 
14

 
4

 
4

Expected return on plan assets
(64
)
 
(20
)
 
(70
)
 
(19
)
 
—

 
—

Amortization of prior service cost (credit)
1

 
(1
)
 
2

 
(1
)
 
(1
)
 
(1
)
Recognized net actuarial loss (gain)
36

 
7

 
37

 
8

 
—

 
(1
)
Settlements
3

 
—

 
1

 
—

 
—

 
—

Net periodic benefit cost
$
98

 
19

 
86

 
22

 
7

 
6




During the first half of 2016, we contributed $11 million to our U.S. benefit plans and $22 million to our international benefit plans. We currently expect to make additional contributions of approximately $325 million to our U.S. benefit plans and $20 million to our international benefit plans during the remainder of 2016. The majority of the additional contributions is discretionary and intended to improve the funded status of our U.S. pension plans.