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Segments
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Segments SEGMENTS

Refinery Operations

Our refinery segment operates for the benefit of the airline segment by providing jet fuel to the airline segment from its own production and through jet fuel obtained through agreements with third parties. The refinery's production consists of jet fuel, as well as non-jet fuel products. We use several counterparties to exchange the non-jet fuel products produced by the refinery for jet fuel consumed in our airline operations. The gross fair value of the products exchanged under these agreements during the three months ended March 31, 2018 and 2017 was $876 million and $733 million, respectively.
Segment Reporting

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
Three Months Ended March 31, 2018
 
 
 
 
 
 
Operating revenue:
$
9,755

$
1,491

 
 
 
$
9,968

Sales to airline segment
 
 
 
$
(262
)
(1) 
 
Exchanged products
 
 
 
(876
)
(2) 
 
Sales of refined products
 
 
 
(140
)
(3) 
 
Operating income
796

44

 
—

 
840

Interest expense (income), net
107

(5
)
 
—

 
102

Depreciation and amortization
595

15

 
—

 
610

Total assets, end of period
52,116

1,962

 
—

 
54,078

Capital expenditures
1,250

15

 
—

 
1,265

 
 
 
 
 
 
 
Three Months Ended March 31, 2017
 
 
 
 
 
 
Operating revenue:
$
9,040

$
1,128

 
 
 
$
9,101

Sales to airline segment
 
 
 
$
(190
)
(1) 
 
Exchanged products
 
 
 
(733
)
(2) 
 
Sales of refined products
 
 
 
(144
)
(3) 
 
Operating income
955

44

 
—

 
999

Interest expense, net
94

—

 
—

 
94

Depreciation and amortization
527

10

 
—

 
537

Total assets, end of period
50,753

1,320

 
—

 
52,073

Capital expenditures
776

26

 
—

 
802

 
(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.