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Revenue (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Passenger Revenue The following table provides the components of Passenger revenue recognized for the three and six months ended June 30, 2019 and 2018:

 
Three months ended June 30,
 
Six months ended June 30,
(in millions)
2019
 
2018
 
2019
 
2018
Passenger non-loyalty
$
4,683

 
$
4,605

 
$
8,726

 
$
8,552

Passenger loyalty - air transportation
622

 
588

 
1,158

 
1,079

Passenger ancillary sold separately
182

 
165

 
347

 
312

   Total passenger revenues
$
5,487

 
$
5,358

 
$
10,231

 
$
9,943
Components of Air Traffic Liability
As of June 30, 2019, and December 31, 2018, the components of Air traffic liability, including contract liabilities based on tickets sold, unused funds available to the Customer, and loyalty points available for redemption, net of expected spoilage, within the unaudited Condensed Consolidated Balance Sheet were as follows:

 
Balance as of
(in millions)
June 30, 2019
 
December 31, 2018
Air traffic liability - passenger travel and ancillary passenger services
$
2,695

 
$
2,059

Air traffic liability - loyalty program
3,289

 
3,011

   Total Air traffic liability
$
5,984

 
$
5,070


Rollforwards of the Company's Air traffic liability - loyalty program for the three and six months ended June 30, 2019 and 2018 were as follows (in millions):

 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Air traffic liability - loyalty program - beginning balance
$
3,171

 
$
2,799

 
$
3,011

 
$
2,667

   Amounts deferred associated with points awarded
757

 
719

 
1,468

 
1,349

   Revenue recognized from points redeemed - Passenger
(622
)
 
(588
)
 
(1,158
)
 
(1,079
)
   Revenue recognized from points redeemed - Other
(17
)
 
(11
)
 
(32
)
 
(18
)
Air traffic liability - loyalty program - ending balance
$
3,289

 
$
2,919

 
$
3,289

 
$
2,919
Rollforward of Air Traffic Liability
Air traffic liability includes consideration received for ticket and loyalty related performance obligations which have not been satisfied as of a given date. Rollforwards of the amounts included in Air traffic liability as of June 30, 2019 and 2018 were as follows (in millions):

 
Air traffic liability
Balance at December 31, 2018
$
5,070

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
11,178

   Revenue from amounts included in contract liability opening balances
(2,855
)
   Revenue from current period sales
(7,409
)
Balance at June 30, 2019
$
5,984



 
Air traffic liability
Balance at December 31, 2017
$
4,565

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
10,927

   Revenue from amounts included in contract liability opening balances
(2,613
)
   Revenue from current period sales
(7,349
)
Balance at June 30, 2018
$
5,530