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Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Summary of Roll Forward of Frequent Flyer Deferred Revenue
The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Total Frequent flyer deferred revenue - beginning balance
$
4,989

 
$
4,891

 
$
4,783

 
$
4,889

Total miles awarded
616

 
525

 
1,826

 
1,544

Travel miles redeemed (Passenger revenue)
(580
)
 
(556
)
 
(1,508
)
 
(1,489
)
Non-travel miles redeemed (Other operating revenue)
(38
)
 
(42
)
 
(114
)
 
(126
)
Total Frequent flyer deferred revenue - ending balance
$
4,987

 
$
4,818

 
$
4,987

 
$
4,818
Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional
The following table presents passenger revenue by geographic region for the three and nine months ended September 30 (in millions):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Domestic
$
6,253

 
$
5,443

 
$
17,403

 
$
15,752

 
 
 
 
 
 
 
 
Atlantic
1,933

 
1,724

 
5,009

 
4,456

Pacific
1,163

 
1,125

 
3,335

 
3,242

Latin America
771

 
777

 
2,403

 
2,423

International
3,867

 
3,626

 
10,747

 
10,121

Consolidated
$
10,120

 
$
9,069

 
$
28,150

 
$
25,873