Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2014 Rate	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	2.00%	3.00%	3.30%
Decrease in valuation allowance	(2.40%)	(367.50%)	(40.80%)
Income tax allocation	0.00%dal_IncomeTaxAllocation	12.70%dal_IncomeTaxAllocation	0.00%dal_IncomeTaxAllocation
Other Adjustments	3.90%	(0.40%)	4.00%
Effective Income Tax Rate	38.50%	(317.20%)	1.50%

Income Tax Allocation

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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