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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Cash sales of mileage credits | $ 980 | $ 841
Majority of new miles redemption period (in years) | 2 years |
Air Traffic |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized that was previously deferred | $ 2,700 |

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- Definition Mileage Credit Redemption, Majority Of New Miles Redemption Period + References No definition available. + Details
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- Definition Sales Of Mileage Credits + References No definition available. + Details
Name: | dal_SalesOfMileageCredits
Namespace Prefix: | dal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |