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Revenue (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2019 and 2018:
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Passenger non-loyalty | $ | 4,400 |  |  | $ | 4,417 |  |  | $ | 13,126 |  |  | $ | 12,969 |
Passenger loyalty - air transportation | 657 |  |  | 623 |  |  | 1,814 |  |  | 1,702 |
Passenger ancillary sold separately | 173 |  |  | 154 |  |  | 522 |  |  | 466 |
Total passenger revenues | $ | 5,230 |  |  | $ | 5,194 |  |  | $ | 15,462 |  |  | $ | 15,137 |
Components of Air Traffic Liability | As of September 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) | September 30, 2019 |  | December 31, 2018
Air traffic liability - passenger travel and ancillary passenger services | $ | 2,627 |  |  | $ | 2,059 |
Air traffic liability - loyalty program | 3,339 |  |  | 3,011 |
Total Air traffic liability | $ | 5,966 |  |  | $ | 5,070 |
Rollforwards of the Company's Air traffic liability - loyalty program for the three and nine months ended September 30, 2019 and 2018 were as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Air traffic liability - loyalty program - beginning balance | $ | 3,289 |  |  | $ | 2,919 |  |  | $ | 3,011 |  |  | $ | 2,667 |
Amounts deferred associated with points awarded | 727 |  |  | 669 |  |  | 2,195 |  |  | 2,027 |
Revenue recognized from points redeemed - Passenger | (657 | ) |  | (623 | ) |  | (1,814 | ) |  | (1,702 | )
Revenue recognized from points redeemed - Other | (20 | ) |  | (17 | ) |  | (53 | ) |  | (44 | )
Air traffic liability - loyalty program - ending balance | $ | 3,339 |  |  | $ | 2,948 |  |  | $ | 3,339 |  |  | $ | 2,948 |
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 September 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) | 16,410 |
Revenue from amounts included in contract liability opening balances | (3,160 | )
Revenue from current period sales | (12,354 | )
Balance at September 30, 2019 | $ | 5,966 |
| Air traffic liability
Balance at December 31, 2017 | $ | 4,565 |
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 16,200 |
Revenue from amounts included in contract liability opening balances | (3,098 | )
Revenue from current period sales | (12,084 | )
Balance at September 30, 2018 | $ | 5,583 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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