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INCOME TAXES - Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Valuation allowance activity |  |
Valuation allowance, beginning | $ 877 | $ 1,176
Tax provision | 74 | (299)
Valuation allowance, ending | $ 951 | $ 877

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- Definition Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Tax Provision + References No definition available. + Details
Name: | dal_ValuationAllowanceDeferredTaxAssetIncreaseDecreaseTaxProvision
Namespace Prefix: | dal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation Allowance Rollforward + References No definition available. + Details
Name: | dal_ValuationAllowanceRollforwardRollForward
Namespace Prefix: | dal_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant