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Revenue (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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