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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax | $ 145 | $ 1,936 | $ 1,553 | $ 3,649 |  |
Passenger Revenue - Loyalty Air Travel | 25 | 95 | 129 | 184 |  |
Other Revenue - Loyalty | 38 | 49 | 88 | 93 |  |
Other Revenue - Non Loyalty | 7 | 25 | 33 | 51 |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 215 | 2,105 | 1,803 | 3,977 |  |
Air Traffic Liability - Passenger Travel | 1,047 |  | 1,047 |  | $ 929 |
Air Traffic Liability - Loyalty Program (Air Transportation) | 676 |  | 676 |  | 661 |
Other Deferred Revenue | 40 |  | 40 |  | 10 |
Contract with Customer, Liability | 1,763 |  | 1,763 |  | 1,600 |
Contract with Customer, Liability, Revenue Recognized |  |  | 666 | 819 |  |
Air Traffic Liability | 676 | $ 617 | 676 | 617 | $ 661 | $ 580
Increase (Decrease) to Air Traffic Liability - Points Redeemed |  |  | (129) | (184) |  |
Increase (Decrease) to Air Traffic Liability - Points Earned |  |  | 144 | $ 221 |  |
Loyalty points, pre-purchase arrangement |  |  | 150 |  |  |
Loyalty points, pre-purchase arrangement, carrying value | $ 113 |  | $ 113 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-30 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 years |  | 3 years |  |  |

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- Definition Value of revenue deferred or cost to provide future products or services, primarily air transportation, associated with programs used by airlines to encourage passenger loyalty by providing rewards geared to the frequency of travel on the sponsoring airline, typically in the form of frequent flyer miles, points, or segments that can be accumulated and converted into free or discounted travel or other redemption options. + References No definition available. + Details
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