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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 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.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2018
2017
 
2018
2017
Ticket
$
9,308

$
8,606

 
$
16,961

$
15,711

Loyalty travel awards
680

622

 
1,298

1,204

Travel-related services
558

540

 
1,052

1,031

Total passenger revenue
$
10,546

$
9,768

 
$
19,311

$
17,946

Other Revenue
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2018
2017
 
2018
2017
Ancillary businesses and refinery
$
522

$
320

 
$
1,042

$
632

Loyalty program
358

316

 
705

621

Miscellaneous
126

156

 
260

299

Total other revenue
$
1,006

$
792

 
$
2,007

$
1,552
Schedule of activity in frequent flyer liability The table below presents the activity of the current and noncurrent frequent flyer liability, and includes miles earned through travel and miles sold, which are primarily through marketing agreements.
(in millions)
 
 
2018
2017
Balance at January 1
 
 
$
6,321

$
5,922

Mileage credits earned
 
 
1,550

1,459

Travel mileage credits redeemed
 
 
(1,298
)
(1,204
)
Non-travel mileage credits redeemed
 
 
(82
)
(81
)
Balance at June 30
 
 
$
6,491

$
6,096
Schedule of revenue by geographic region Our passenger revenue by geographic region (as defined by the U.S. Department of Transportation) is summarized in the following table:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2018
2017
 
2018
2017
Domestic
$
7,413

$
6,888

 
$
13,714

$
12,790

Atlantic
1,782

1,566

 
2,841

2,495

Latin America
709

714

 
1,536

1,489

Pacific
642

600

 
1,220

1,172

Total passenger revenue
$
10,546

$
9,768

 
$
19,311

$
17,946