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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2020 and 2019 (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 | 2019 |  | 2020 | 2019
Passenger revenue |  |  |  |  |
Passenger travel | $ | 420 |  | $ | 1,914 |  |  | $ | 1,973 |  | $ | 5,563 |
Loyalty revenue - air transportation | 25 |  | 91 |  |  | 153 |  | 275 |
Other revenue |  |  |  |  |
Loyalty revenue | 38 |  | 54 |  |  | 127 |  | 146 |
Other revenue | 9 |  | 27 |  |  | 42 |  | 79 |
Total revenue | $ | 492 |  | $ | 2,086 |  |  | $ | 2,295 |  | $ | 6,063 |
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.
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):
| September 30, 2020 |  | December 31, 2019
Air traffic liability - passenger travel | $ | 1,020 |  |  | $ | 929 |
Air traffic liability - loyalty program (air transportation) | 703 |  |  | 661 |
Deferred revenue | 42 |  |  | 10 |
Total | $ | 1,765 |  |  | $ | 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 nine months ended September 30, 2020 and 2019 (in millions):
Balance at December 31, 2019 | $ | 661 |
TrueBlue® points redeemed | (153 | )
TrueBlue® points earned and sold | 195 |
Balance at September 30, 2020 | $ | 703 |
Balance at December 31, 2018 | $ | 580 |
TrueBlue® points redeemed | (275 | )
TrueBlue® points earned and sold | 342 |
Balance at September 30, 2019 | $ | 647 |

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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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