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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018 and 2017:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Passenger non-loyalty | $ | 4,605 |  |  | $ | 4,643 |  |  | $ | 8,552 |  |  | $ | 8,551 |
Passenger loyalty - air transportation | 588 |  |  | 602 |  |  | 1,079 |  |  | 1,108 |
Passenger ancillary sold separately | 165 |  |  | 134 |  |  | 312 |  |  | 266 |
Total passenger revenues | $ | 5,358 |  |  | $ | 5,379 |  |  | $ | 9,943 |  |  | $ | 9,925 |
Components of Air Traffic Liability | The components of Air traffic liability, including contract liabilities based on tickets sold, unused funds available to the Customer, and frequent flyer 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, 2018 |  | December 31, 2017
Air traffic liability - passenger travel and ancillary passenger services | $ | 2,611 |  |  | $ | 1,898 |
Air traffic liability - loyalty program | 2,919 |  |  | 2,667 |
Total Air traffic liability | $ | 5,530 |  |  | $ | 4,565 |
A rollforward of the Company's Air traffic liability - loyalty program for the three and six months ended June 30, 2018 and 2017 is as follows (in millions):
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Air traffic liability - loyalty program - beginning balance | $ | 2,799 |  |  | $ | 2,560 |  |  | $ | 2,667 |  |  | $ | 2,485 |
Amounts deferred associated with points awarded | 719 |  |  | 632 |  |  | 1,349 |  |  | 1,216 |
Revenue recognized from points redeemed - Passenger | (588 | ) |  | (602 | ) |  | (1,079 | ) |  | (1,108 | )
Revenue recognized from points redeemed - Other | (11 | ) |  | (4 | ) |  | (18 | ) |  | (7 | )
Air traffic liability - loyalty program - ending balance | $ | 2,919 |  |  | $ | 2,586 |  |  | $ | 2,919 |  |  | $ | 2,586 |
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 June 30, 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) | 10,927 |
Revenue from amounts included in contract liability opening balances (a) | (2,613 | )
Revenue from current period sales (a) | (7,349 | )
Balance at June 30, 2018 | $ | 5,530 |
(a) Does not include certain ancillary revenues that are purchased on the day of travel, which do not flow through Air traffic liability.
| Air traffic liability
Balance at December 31, 2016 | $ | 4,221 |
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 10,853 |
Revenue from amounts included in contract liability opening balances (a) | (2,370 | )
Revenue from current period sales (a) | (7,562 | )
Balance at June 30, 2017 | $ | 5,142 |
(a) Does not include certain ancillary revenues that are purchased on the day of travel, which do not flow through Air traffic liability.

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