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Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Passenger Revenue
The following table provides the components of Passenger revenue recognized for the years ended December 31, 2018, 2017, and 2016:

 
Year ended December 31,
(in millions)
2018
 
2017
 
2016
 
 
 
As Recast
 
As Recast
Passenger non-loyalty
$
17,506

 
$
16,934

 
$
16,534

Passenger loyalty - air transportation
2,307

 
2,263

 
1,997

Passenger ancillary sold separately
642

 
566

 
537

   Total passenger revenues
$
20,455

 
$
19,763

 
$
19,068
Components of Air Traffic Liability
As of the years ended December 31, 2018 and 2017, 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 Consolidated Balance Sheet were as follows:

 
Balance as of
(in millions)
December 31, 2018
 
December 31, 2017
Air traffic liability - passenger travel and ancillary passenger services
$
2,059

 
$
1,898

Air traffic liability - loyalty program
3,011

 
2,667

   Total Air traffic liability
$
5,070

 
$
4,565

A rollforward of the Company's Air traffic liability - loyalty program for the years ended December 31, 2018 and 2017 is as follows (in millions):

 
Year ended December 31,
 
2018
 
2017
Air traffic liability - loyalty program - beginning balance
$
2,667

 
$
2,485

   Amounts deferred associated with points awarded
2,717

 
2,485

   Revenue recognized from points redeemed - Passenger
(2,307
)
 
(2,263
)
   Revenue recognized from points redeemed - Other
(66
)
 
(40
)
Air traffic liability - loyalty program - ending balance
$
3,011

 
$
2,667
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. A rollforward of the amounts included in Air traffic liability as of December 31, 2018 and 2017 are as follows (in millions):

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

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
21,026

   Revenue from amounts included in contract liability opening balances
(3,479
)
   Revenue from current period sales
(17,042
)
Balance at December 31, 2018
$
5,070



 
Air traffic liability
Balance at December 31, 2016
$
4,221

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
20,146

   Revenue from amounts included in contract liability opening balances
(3,099
)
   Revenue from current period sales
(16,703
)
Balance at December 31, 2017
$
4,565