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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table provides the revenue recognized by revenue source for the years ended December 31, 2020, 2019, and 2018 (in millions):
|  | 2020 |  | 2019 |  | 2018
Passenger revenue |  |  |  |  |  |
Passenger travel |  | $ | 2,551 |  |  | $ | 7,395 |  |  | $ | 7,061 |
Loyalty revenue - air transportation |  | 182 |  |  | 391 |  |  | 320 |
Other revenue |  |  |  |  |  |
Loyalty revenue |  | 168 |  |  | 201 |  |  | 168 |
Other revenue |  | 56 |  |  | 107 |  |  | 109 |
Total revenue |  | $ | 2,957 |  |  | $ | 8,094 |  |  | $ | 7,658 |
Contract with customer, asset and liability | Our contract liabilities primarily consist of ticket sales for which transportation has not yet been provided, unused credits available to customers, and outstanding loyalty points available for redemption (in millions):
|  | December 31, 2020 |  | December 31, 2019
Air traffic liability - passenger travel |  | $ | 964 |  |  | $ | 929 |
Air traffic liability - loyalty program (air transportation) |  | 733 |  |  | 661 |
Deferred revenue |  | 41 |  |  | 10 |
Total |  | $ | 1,738 |  |  | $ | 1,600 |
The table below presents the activity of the current and non-current air traffic liability for our loyalty program, and includes points earned and sold to participating companies (in millions):
Balance at December 31, 2018 | $ | 580 |
TrueBlue® points redeemed | (391) |
TrueBlue® points earned and sold | 472 |
Balance at December 31, 2019 | 661 |
TrueBlue® points redeemed | (182) |
TrueBlue® points earned and sold | 254 |
Balance at December 31, 2020 | $ | 733 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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