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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Operating results and capital expenditures information by segment
The following table summarizes certain operating results and capital expenditures information by segment:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2019
 
2018
 
2019
 
2018
Net sales
 
 
 
 
 
 
 
Petroleum
$
1,552

 
$
1,824

 
$
2,949

 
$
3,282

Nitrogen Fertilizer
138

 
93

 
230

 
173

Other
(3
)
 
(3
)
 
(6
)
 
(4
)
Total
$
1,687

 
$
1,914

 
$
3,173

 
$
3,451

Operating Income
 
 
 
 
 
 
 
Petroleum
$
163

 
$
113

 
$
319

 
$
256

Nitrogen Fertilizer
35

 
—

 
44

 
(4
)
Other
(6
)
 
(6
)
 
(11
)
 
(8
)
Total
192

 
107

 
352

 
244

Interest expense, net
(26
)
 
(26
)
 
(52
)
 
(53
)
Other income, net
3

 
2

 
6

 
3

Income before income taxes
$
169

 
$
83

 
$
306

 
$
194

Depreciation and amortization
 
 
 
 
 
 
 
Petroleum
$
52

 
$
49

 
$
101

 
$
97

Nitrogen Fertilizer
25

 
20

 
42

 
37

Other
1

 
2

 
2

 
3

Total
$
78

 
$
71

 
$
145

 
$
137

Capital expenditures (1)
 
 
 
 
 
 
 
Petroleum
$
17

 
$
15

 
$
38

 
$
29

Nitrogen Fertilizer
2

 
7

 
5

 
11

Other
3

 
1

 
3

 
2

Total
$
22

 
$
23

 
$
46

 
$
42


The following table summarizes total assets by segment:
(in millions)
June 30, 2019
 
December 31, 2018
Petroleum
$
2,833

 
$
2,453

Nitrogen Fertilizer
1,190

 
1,254

Other (2)
(193
)
 
293

Total Assets
$
3,830

 
$
4,000


 
(1)Capital expenditures are shown exclusive of turnarounds.
(2)Includes elimination of intercompany assets.