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REVENUE - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Residual travel funds (as a percent) | 1600.00% | 2800.00% | 200.00%
Remaining customer travel funds | $ 1,300 |  |
Loyalty points, redemption period (in years) | 2 years |  |
Total operating revenues | $ 15,790 | $ 9,048 | $ 22,428
Chase Bank USA Agreement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Total operating revenues | $ 1,400 | $ 1,100 | $ 1,300

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