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Consolidated Statements of Stockholders' Equity (Deficit) (Parentheticals) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
weighted average price per treasury share withheld for taxes $ 31.46dal_WeightedAveragePricePerTreasuryShareWithheldForTaxes $ 14.97dal_WeightedAveragePricePerTreasuryShareWithheldForTaxes $ 10.91dal_WeightedAveragePricePerTreasuryShareWithheldForTaxes