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Revenue (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Total Frequent flyer deferred revenue - beginning balance
$
4,937

 
$
4,940

 
$
4,783

 
$
4,889

Total miles awarded
607

 
531

 
1,210

 
1,019

Travel miles redeemed (Passenger revenue)
(519
)
 
(535
)
 
(928
)
 
(933
)
Non-travel miles redeemed (Other operating revenue)
(36
)
 
(45
)
 
(76
)
 
(84
)
Total Frequent flyer deferred revenue - ending balance
$
4,989

 
$
4,891

 
$
4,989

 
$
4,891
Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional
The following table presents passenger revenue by geographic region and by mainline versus regional for the three and six months ended June 30 (in millions):

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Mainline
$
4,395

 
$
4,043

 
$
7,881

 
$
7,315

Regional
1,786

 
1,615

 
3,269

 
2,994

Domestic
6,181

 
5,658

 
11,150

 
10,309

 
 
 
 
 
 
 
 
Atlantic
1,824

 
1,615

 
3,076

 
2,732

Pacific
1,103

 
1,064

 
2,172

 
2,117

Latin America
772

 
814

 
1,632

 
1,646

International
3,699

 
3,493

 
6,880

 
6,495

 
 
 
 
 
 
 
 
Consolidated
$
9,880

 
$
9,151

 
$
18,030

 
$
16,804

 
 
 
 
 
 
 
 
Mainline
8,045

 
7,492

 
14,661

 
13,719

Regional
1,835

 
1,659

 
3,369

 
3,085

Consolidated
$
9,880

 
$
9,151

 
$
18,030

 
$
16,804