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GOODWILL AND INTANGIBLE ASSETS - Valuation of Goodwill and Indefinite-Lived Intangible (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Goodwill and indefinite-lived intangible assets |  |
Goodwill | $ 9,753 | $ 9,753
Goodwill and indefinite-lived intangible assets | $ 15,671 | 15,671
Minimum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, goodwill (greater than) | 100.00% |
International routes and slots |  |
Goodwill and indefinite-lived intangible assets |  |
Indefinite-lived intangibles | $ 2,583 | 2,583
International routes and slots | Minimum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets | 20.00% |
International routes and slots | Maximum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets | 100.00% |
Airline alliances |  |
Goodwill and indefinite-lived intangible assets |  |
Indefinite-lived intangibles | $ 1,863 | 1,863
Airline alliances | Minimum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets | 30.00% |
Airline alliances | Maximum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets (greater than) | 100.00% |
Delta tradename |  |
Goodwill and indefinite-lived intangible assets |  |
Indefinite-lived intangibles | $ 850 | 850
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets (greater than) | 100.00% |
Domestic slots |  |
Goodwill and indefinite-lived intangible assets |  |
Indefinite-lived intangibles | $ 622 | $ 622
Domestic slots | Minimum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets | 60.00% |
Domestic slots | Maximum |  |
Excess Fair Value at 2023 Testing Date |  |
Excess fair value, indefinite-lived intangible assets (greater than) | 100.00% |

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