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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following table provides the revenues recognized by revenue source for the three and six months ended June 30, 2020 and 2019 (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2020 | 2019 |  | 2020 | 2019
Passenger revenue |  |  |  |  |
Passenger travel | $ | 145 |  | $ | 1,936 |  |  | $ | 1,553 |  | $ | 3,649 |
Loyalty revenue - air transportation | 25 |  | 95 |  |  | 129 |  | 184 |
Other revenue |  |  |  |  |
Loyalty revenue | 38 |  | 49 |  |  | 88 |  | 93 |
Other revenue | 7 |  | 25 |  |  | 33 |  | 51 |
Total revenue | $ | 215 |  | $ | 2,105 |  |  | $ | 1,803 |  | $ | 3,977 |
For the three and six months ended June 30, 2020, TrueBlue® points earned from ticket purchases are presented as a reduction to Passenger travel within passenger revenue. Amounts presented in Loyalty revenue - air transportation represent the revenue recognized when TrueBlue® points have been redeemed and the travel has occurred. The corresponding amounts within the three and six months ended June 30, 2019 have been reclassified to be comparable with the current period presentation. These reclassifications do not impact total passenger revenue.
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] | 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):
| June 30, 2020 |  | December 31, 2019
Air traffic liability - passenger travel | $ | 1,047 |  |  | $ | 929 |
Air traffic liability - loyalty program (air transportation) | 676 |  |  | 661 |
Deferred revenue | 40 |  |  | 10 |
Total | $ | 1,763 |  |  | $ | 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 for the six months ended June 30, 2020 and 2019 (in millions):
Balance at December 31, 2019 | $ | 661 |
TrueBlue® points redeemed | (129 | )
TrueBlue® points earned and sold | 144 |
Balance at June 30, 2020 | $ | 676 |
Balance at December 31, 2018 | $ | 580 |
TrueBlue® points redeemed | (184 | )
TrueBlue® points earned and sold | 221 |
Balance at June 30, 2019 | $ | 617 |

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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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