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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue Passenger revenue is primarily composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.
 
Year Ended December 31,
(in millions)
2018
2017
2016
Ticket
$
34,950

$
32,467

$
31,534

Loyalty travel awards
2,651

2,403

2,234

Travel-related services
2,154

2,077

2,046

Total passenger revenue
$
39,755

$
36,947

$
35,814

Other Revenue
 
Year Ended December 31,
(in millions)
2018
2017
2016
Ancillary businesses and refinery
$
1,801

$
1,591

$
1,293

Loyalty program
1,459

1,269

1,110

Miscellaneous
558

587

549

Total other revenue
$
3,818

$
3,447

$
2,952
Schedule of activity in frequent flyer liability The table below presents the activity of the current and noncurrent loyalty program liability, and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.
(in millions)
2018
2017
Balance at January 1
$
6,321

$
5,922

Mileage credits earned
3,142

2,948

Travel mileage credits redeemed
(2,651
)
(2,403
)
Non-travel mileage credits redeemed
(171
)
(146
)
Balance at December 31
$
6,641

$
6,321
Schedule of revenue by geographic region Operating revenue for the airline segment is recognized in a specific geographic region based on the origin, flight path and destination of each flight segment. The majority of the revenues of the refinery, consisting of fuel sales to the airline, have been eliminated in the Consolidated Financial Statements. The remaining operating revenue for the refinery segment is included in the domestic region. Our passenger and operating revenue by geographic region (as defined by the U.S. Department of Transportation) is summarized in the following table:
 
Passenger Revenue
 
Operating Revenue
 
Year Ended December 31,
 
Year Ended December 31,
(in millions)
2018
2017
2016
 
2018
2017
2016
Domestic
$
28,159

$
26,079

$
25,002

 
$
31,233

$
28,850

$
27,309

Atlantic
6,165

5,537

5,419

 
7,042

6,297

6,115

Latin America
2,888

2,862

2,686

 
3,181

3,133

2,939

Pacific
2,543

2,469

2,707

 
2,982

2,858

3,087

Total
$
39,755

$
36,947

$
35,814

 
$
44,438

$
41,138

$
39,450