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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of segment information
The following tables summarize operating results, capital expenditures, and total asset information by segment:
 
Year Ended December 31,
(in millions)
2018
 
2017
 
2016
Net sales
 
 
 
 
 
Petroleum
$
6,780

 
$
5,664

 
$
4,431

Nitrogen Fertilizer
351

 
331

 
356

Other
(7
)
 
(7
)
 
(5
)
Total net sales
$
7,124

 
$
5,988

 
$
4,782

Operating income (loss)
 
 
 
 
 
Petroleum
$
544

 
$
172

 
$
60

Nitrogen Fertilizer
6

 
(10
)
 
26

Other
(18
)
 
(17
)
 
(14
)
Total operating income (loss)
$
532

 
$
145

 
$
72

Interest expense, net
(102
)
 
(109
)
 
(83
)
Other income, net
15

 
2

 
2

Earnings before income taxes
$
445

 
$
38

 
$
(9
)
Depreciation and amortization
 
 
 
 
 
Petroleum
$
196

 
$
177

 
$
165

Nitrogen Fertilizer
72

 
74

 
58

Other
6

 
7

 
6

Total depreciation and amortization
$
274

 
$
258

 
$
229

Capital expenditures
 
 
 
 
 
Petroleum
$
79

 
$
101

 
$
102

Nitrogen fertilizer
19

 
14

 
23

Other
4

 
5

 
8

Total
$
102

 
$
120

 
$
133


 
Year Ended December 31,
(in millions)
2018
 
2017
 
2016
Total assets
 
 
 
 
 
Petroleum
$
2,453

 
$
2,416

 
$
2,441

Nitrogen Fertilizer
1,254

 
1,234

 
1,312

Other
293

 
303

 
406

Total
$
4,000

 
$
3,953

 
$
4,159