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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
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