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Commitments and Contingencies - Devaluation and Other Contingencies (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
employee
Intercompany Foreign Currency Balance [Line Items]  
Entity number of employees 81,000dei_EntityNumberOfEmployees
Percentage of employees represented by unions under collective bargaining agreements 18.00%dal_PercentageOfEmployeesRepresentedByUnionsUnderCollectiveBargainingAgreements
Venezuelan bolívar fuerte  
Intercompany Foreign Currency Balance [Line Items]  
Asset, reporting currency denominated, value 93us-gaap_AssetReportingCurrencyDenominatedValue
/ us-gaap_CurrencyAxis
= currency_VEF