GOODWILL AND INTANGIBLE ASSETS - Valuation of Goodwill and Indefinite-Lived Intangible (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
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%

Indefinite-Lived Intangible Asset, Percentage Of Fair Value In Excess Of Carrying Amount

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Indefinite-Lived Intangible Asset, Percentage Of Fair Value In Excess Of Carrying Amount, Greater Than

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- Definition

Indefinite-Lived Intangible Assets And Goodwill

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Indefinite-Lived Intangible Assets, Including Goodwill

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Indefinite-Lived Intangible Assets, Including Goodwill, Excess Fair Value Testing

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Percentage of fair value of reporting unit in excess of carrying amount.

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