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Business Segments (Tables)
3 Months Ended
Mar. 31, 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 March 31,
(in millions)
2019
 
2018
Net sales
 
 
 
Petroleum
$
1,397

 
$
1,458

Nitrogen Fertilizer
92

 
80

Other
(3
)
 
(1
)
Total
$
1,486

 
$
1,537

Operating Income
 
 
 
Petroleum
$
156

 
$
143

Nitrogen Fertilizer
9

 
(3
)
Other
(5
)
 
(4
)
Total operating income
160

 
136

Interest expense, net
(26
)
 
(27
)
Other income, net
3

 
2

Income before income taxes
$
137

 
$
111

Depreciation and amortization
 
 
 
Petroleum
49

 
48

Nitrogen Fertilizer
16

 
16

Other
2

 
3

Total
$
67

 
$
67

Capital expenditures
 
 
 
Petroleum
$
20

 
$
14

Nitrogen Fertilizer
3

 
4

Other

 
1

Total
$
23

 
$
19


The following table summarizes total assets by segment:
(in millions)
March 31,
2019
 
December 31,
2018
Petroleum
$
2,714

 
$
2,452

Nitrogen Fertilizer
1,247

 
1,254

Other (1)
(87
)
 
294

Total Assets
$
3,874

 
$
4,000

 
 
 
 

 
(1)Includes elimination of intercompany assets.