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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Debt Instrument [Line Items]    
Secured debt $ 9,316us-gaap_SecuredDebt $ 11,074us-gaap_SecuredDebt
Long-term debt, gross 9,469us-gaap_DebtInstrumentCarryingAmount 11,228us-gaap_DebtInstrumentCarryingAmount
Unamortized discount, net (90)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet (383)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Long-term debt 9,379us-gaap_LongTermDebt 10,845us-gaap_LongTermDebt
Long-term debt, current maturities (1,109)us-gaap_LongTermDebtCurrent (1,449)us-gaap_LongTermDebtCurrent
Long-term debt, excluding current maturities 8,270us-gaap_LongTermDebtNoncurrent 9,396us-gaap_LongTermDebtNoncurrent
Pacific Term Loan B-1    
Debt Instrument [Line Items]    
Debt instrument, maturity date Oct. 31, 2018  
Debt instrument, interest rate, stated percentage 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB1Member		 [1],[2],[3]  
Secured debt 1,078us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB1Member		 [1],[2],[3],[4] 1,089us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB1Member		 [1],[2],[3],[4]
Pacific Term Loan B-2    
Debt Instrument [Line Items]    
Debt instrument, maturity date Apr. 30, 2016  
Debt instrument, interest rate, stated percentage 2.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB2Member		 [1],[2],[3]  
Secured debt 392us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB2Member		 [1],[2],[3],[4] 396us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_PacificTermLoanB2Member		 [1],[2],[3],[4]
Pacific Revolving Facility    
Debt Instrument [Line Items]    
Debt instrument, maturity date Oct. 31, 2017  
Line of credit facility, amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= dal_A2012PacificRevolvingFacilityMember		 [2],[3] 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= dal_A2012PacificRevolvingFacilityMember		 [2],[3]
Term Loan Facility    
Debt Instrument [Line Items]    
Debt instrument, maturity date Apr. 30, 2017  
Debt instrument, interest rate, stated percentage 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dal_TermLoanFacilityMember		 [1],[2],[5]  
Secured debt 1,327us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_TermLoanFacilityMember		 [1],[2],[4],[5] 1,341us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_TermLoanFacilityMember		 [1],[2],[4],[5]
Revolving Credit Facility    
Debt Instrument [Line Items]    
Debt instrument, maturity date Apr. 30, 2016  
Line of credit facility, amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		 [2],[5] 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		 [2],[5]
Certificates    
Debt Instrument [Line Items]    
Secured debt 3,226us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_CertificatesMember		 [6],[7] 3,834us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_CertificatesMember		 [6],[7]
Debt instrument, maturity date range, start Jan. 01, 2015  
Debt instrument, maturity date range, end Dec. 31, 2023  
Debt instrument, interest rate, stated percentage rate range, minimum 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dal_CertificatesMember		  
Debt instrument, interest rate, stated percentage rate range, maximum 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dal_CertificatesMember		  
Aircraft financings    
Debt Instrument [Line Items]    
Secured debt 2,988us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_AircraftFinancingsMember		 [6],[7] 3,787us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_AircraftFinancingsMember		 [6],[7]
Debt instrument, maturity date range, start Jan. 01, 2015  
Debt instrument, maturity date range, end Dec. 31, 2026  
Debt instrument, interest rate, stated percentage rate range, minimum 0.62%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dal_AircraftFinancingsMember		  
Debt instrument, interest rate, stated percentage rate range, maximum 6.76%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dal_AircraftFinancingsMember		  
Other secured financings    
Debt Instrument [Line Items]    
Secured debt 305us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_OtherSecuredFinancingsMember		 [7],[8] 627us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_OtherSecuredFinancingsMember		 [7],[8]
Debt instrument, maturity date range, start Jan. 01, 2015  
Debt instrument, maturity date range, end Dec. 31, 2031  
Debt instrument, interest rate, stated percentage rate range, minimum 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dal_OtherSecuredFinancingsMember		  
Debt instrument, interest rate, stated percentage rate range, maximum 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dal_OtherSecuredFinancingsMember		  
Bank revolving credit facilities    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= dal_BankRevolvingCreditFacilitiesMember		 [2] 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= dal_BankRevolvingCreditFacilitiesMember		 [2]
Debt instrument, maturity date range, start Jan. 01, 2015  
Debt instrument, maturity date range, end Dec. 31, 2017  
Other unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, maturity date range, start Jan. 01, 2015  
Debt instrument, maturity date range, end Dec. 31, 2035  
Debt instrument, interest rate, stated percentage rate range, minimum 3.01%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dal_OtherUnsecuredDebtMember		  
Debt instrument, interest rate, stated percentage rate range, maximum 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dal_OtherUnsecuredDebtMember		  
Other unsecured debt $ 153us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_OtherUnsecuredDebtMember		 [7] $ 154us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= dal_OtherUnsecuredDebtMember		 [7]
[1] Borrowings must be repaid annually in an amount equal to 1% per year of the original principal amount (paid in equal quarterly installments), with the balance due on the final maturity date.
[2] Guaranteed by substantially all of our domestic subsidiaries (the "Guarantors").
[3] Secured by a first lien on our Pacific route authorities and certain related assets.
[4] Interest rate equal to LIBOR (generally subject to a floor) or another index rate, in each case plus a specified margin. Additionally, certain aircraft and other financings are comprised of variable rate debt.
[5] Secured by liens on certain of our and the Guarantors' assets, including accounts receivable, flight equipment, ground property and equipment, certain aircraft, spare engines and parts, certain non-Pacific international routes, domestic slots, real estate and certain investments. These assets also secure $250 million of certain fuel hedging obligations pari passu (i.e., on equal priority) with the term loan and revolver.
[6] Secured by aircraft.
[7] Due in installments.
[8] Primarily includes loans secured by spare parts, spare engines and real estate.