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Segments and Geograhic Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Reconciliation of segments to consolidated amounts Our operating revenue by geographic region (as defined by the U.S. Department of Transportation) is summarized in the following table:
 
Year Ended December 31,
(in millions)
2017
2016
2015
Domestic
$
29,556

$
28,108

$
27,884

Atlantic
6,044

5,919

6,505

Pacific
2,730

2,939

3,503

Latin America
2,914

2,673

2,812

Total
$
41,244

$
39,639

$
40,704

Segment results are prepared based on our internal accounting methods described below, with reconciliations to consolidated amounts in accordance with GAAP. Our segments are not designed to measure operating income or loss directly related to the products and services included in each segment on a stand-alone basis.
(in millions)
Airline
Refinery
 
Intersegment Sales/Other
 
Consolidated
Year Ended December 31, 2017
 
 
 
 
 
 
Operating revenue:
$
40,742

$
5,039

 
 
 
$
41,244

Sales to airline segment
 
 
 
$
(886
)
(1) 
 
Exchanged products
 
 
 
(3,240
)
(2) 
 
Sales of refined products
 
 
 
(411
)
(3) 
 
Operating income
6,004

110

 
 
 
6,114

Interest expense (income), net
403

(7
)
 
 
 
396

Depreciation and amortization
2,188

47

 
 
 
2,235

Total assets, end of period
51,165

2,127

 
 
 
53,292

Capital expenditures
3,743

148

 
 
 
3,891

Year Ended December 31, 2016
 
 
 
 
 
 
Operating revenue:
$
39,406

$
3,843

 
 
 
$
39,639

Sales to airline segment
 
 
 
$
(695
)
(1) 
 
Exchanged products
 
 
 
(2,658
)
(2) 
 
Sales of refined products
 
 
 
(257
)
(3) 
 
Operating income (loss)(4)
7,077

(125
)
 
 
 
6,952

Interest expense, net
386

2

 
 
 
388

Depreciation and amortization
1,862

40

 
 
 
1,902

Total assets, end of period
49,930

1,331

 
 
 
51,261

Capital expenditures
3,270

121

 
 
 
3,391

Year Ended December 31, 2015
 
 
 
 
 
 
Operating revenue:
$
40,398

$
4,741

 
 
 
$
40,704

Sales to airline segment
 
 
 
$
(990
)
(1) 
 
Exchanged products
 
 
 
(3,108
)
(2) 
 
Sales of refined products
 
 
 
(337
)
(3) 
 
Operating income(4)
7,512

290

 
 
 
7,802

Interest expense, net
481

—

 
 
 
481

Depreciation and amortization
1,805

30

 
 
 
1,835

Total assets, end of period
51,785

1,349

 
 
 
53,134

Capital expenditures
2,853

92

 
 
 
2,945


(1) 
Represents transfers, valued on a market price basis, from the refinery to the airline segment for use in airline operations. We determine market price by reference to the market index for the primary delivery location, which is New York Harbor, for jet fuel from the refinery.
(2) 
Represents value of products delivered under our exchange agreements, as discussed above, determined on a market price basis.
(3) 
These sales were at or near cost; accordingly, the margin on these sales is de minimis.
(4) 
Includes the impact of pricing arrangements between the airline and refinery segments with respect to the refinery's inventory price risk.