$ALK
ALASKA AIR GROUP, INC. Stock $alk

$alk Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000076642118000015 Filed on February 15, 2018

Income Statement

Concept	2017 Q4	2016 Q4	2015 Q4
Revenue	$1.942B	$1.518B	$1.377B
YoY Change	27.93%	10.24%	5.44%
Cost Of Revenue	$881.0M	$553.0M	$425.0M
YoY Change	59.31%	30.12%	-23.84%
Gross Profit	$1.061B	$965.0M	$952.0M
YoY Change	9.95%	1.37%	27.27%
Gross Profit Margin	54.63%	63.57%	69.14%
Selling, General & Admin	$662.0M	$504.0M	$484.0M
YoY Change	31.35%	4.13%	27.03%
% of Gross Profit	62.39%	52.23%	50.84%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$97.00M	$82.00M	$84.00M
YoY Change	18.29%	-2.38%	10.53%
% of Gross Profit	9.14%	8.5%	8.82%
Operating Expenses	$900.0M	$686.0M	$665.0M
YoY Change	31.2%	3.16%	24.07%
Operating Profit	$161.0M	$279.0M	$287.0M
YoY Change	-42.29%	-2.79%	35.38%
Interest Expense	-$7.000M	-$11.00M	$4.000M
YoY Change	-36.36%	-375.0%
% of Operating Profit	-4.35%	-3.94%	1.39%
Other Income/Expense, Net	$2.000M	$15.00M	$0.00
YoY Change	-86.67%
Pretax Income	$126.0M	$202.0M	$259.0M
YoY Change	-37.62%	-22.01%	7.02%
Income Tax	$48.00M	$105.0M	$68.00M
% Of Pretax Income	38.1%	51.98%	26.25%
Net Earnings	$315.0M	$97.00M	$191.0M
YoY Change	224.74%	-49.21%	29.05%
Net Earnings / Revenue	16.22%	6.39%	13.87%
Basic Earnings Per Share
Diluted Earnings Per Share	$2.574M	$779.7K	$1.505M
COMMON SHARES
Basic Shares Outstanding	123.0M shares	123.3M shares	126.1M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2017 Q4	2016 Q4	2015 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.621B	$1.580B	$1.328B
YoY Change	2.59%	18.98%	9.12%
Cash & Equivalents	$194.0M	$328.0M	$73.00M
Short-Term Investments	$1.427B	$1.252B	$1.255B
Other Short-Term Assets	$133.0M	$121.0M	$72.00M
YoY Change	9.92%	68.06%	-31.43%
Inventory	$57.00M	$47.00M	$51.00M
Prepaid Expenses
Receivables	$341.0M	$302.0M	$212.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.152B	$2.050B	$1.663B
YoY Change	4.98%	23.27%	1.46%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.284B	$5.666B	$4.802B
YoY Change	10.91%	17.99%	11.7%
Goodwill	$1.943B	$1.934B	$0.00
YoY Change	0.47%
Intangibles	$133.0M	$143.0M	$0.00
YoY Change	-6.99%
Long-Term Investments			$2.000M
YoY Change			-50.0%
Other Assets	$234.0M	$169.0M	$65.00M
YoY Change	38.46%	160.0%	-48.41%
Total Long-Term Assets	$8.594B	$7.912B	$4.867B
YoY Change	8.62%	62.56%	9.99%
TOTAL ASSETS
Total Short-Term Assets	$2.152B	$2.050B	$1.663B
Total Long-Term Assets	$8.594B	$7.912B	$4.867B
Total Assets	$10.75B	$9.962B	$6.530B
YoY Change	7.87%	52.56%	7.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$120.0M	$92.00M	$63.00M
YoY Change	30.43%	46.03%	1.61%
Accrued Expenses	$400.0M	$878.0M	$661.0M
YoY Change	-54.44%	32.83%	12.99%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$307.0M	$319.0M	$114.0M
YoY Change	-3.76%	179.82%	-2.56%
Total Short-Term Liabilities	$2.686B	$2.535B	$1.805B
YoY Change	5.96%	40.44%	8.02%
LONG-TERM LIABILITIES
Long-Term Debt	$2.262B	$2.645B	$569.0M
YoY Change	-14.48%	364.85%	-17.06%
Other Long-Term Liabilities	$425.0M	$417.0M	$362.0M
YoY Change	1.92%	15.19%	10.7%
Total Long-Term Liabilities	$2.338B	$1.851B	$1.745B
YoY Change	26.31%	6.07%	2.83%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.686B	$2.535B	$1.805B
Total Long-Term Liabilities	$2.338B	$1.851B	$1.745B
Total Liabilities	$5.024B	$4.386B	$3.550B
YoY Change	14.55%	23.55%	5.4%
SHAREHOLDERS EQUITY
Retained Earnings	$4.193B	$3.568B	$2.890B
YoY Change	17.52%	23.46%	34.79%
Common Stock	$165.0M	$111.0M	$74.00M
YoY Change	48.65%	50.0%	-75.08%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$518.0M	$443.0M	$250.0M
YoY Change	16.93%	77.2%	6150.0%
Treasury Stock Shares	6.843M shares	5.862M shares	3.267M shares
Shareholders Equity	$3.460B	$2.744B	$2.411B
YoY Change
Total Liabilities & Shareholders Equity	$10.75B	$9.962B	$6.530B
YoY Change	7.87%	52.56%	7.68%

Cashflow Statement

Concept	2017 Q4	2016 Q4	2015 Q4
OPERATING ACTIVITIES
Net Income	$315.0M	$97.00M	$191.0M
YoY Change	224.74%	-49.21%	29.05%
Depreciation, Depletion And Amortization	$97.00M	$82.00M	$84.00M
YoY Change	18.29%	-2.38%	10.53%
Cash From Operating Activities	$233.0M	$180.0M	$355.0M
YoY Change	29.44%	-49.3%	157.25%
INVESTING ACTIVITIES
Capital Expenditures	-$185.0M	-$169.0M	-$162.0M
YoY Change	9.47%	4.32%	23.66%
Acquisitions
YoY Change
Other Investing Activities	$198.0M	-$1.812B	-$41.00M
YoY Change	-110.93%	4319.51%	-119.71%
Cash From Investing Activities	$13.00M	-$1.981B	-$203.0M
YoY Change	-100.66%	875.86%	-363.64%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-193.0M	311.0M	-167.0M
YoY Change	-162.06%	-286.23%	17.61%
NET CHANGE
Cash From Operating Activities	233.0M	180.0M	355.0M
Cash From Investing Activities	13.00M	-1.981B	-203.0M
Cash From Financing Activities	-193.0M	311.0M	-167.0M
Net Change In Cash	53.00M	-1.490B	-15.00M
YoY Change	-103.56%	9833.33%	-120.55%
FREE CASH FLOW
Cash From Operating Activities	$233.0M	$180.0M	$355.0M
Capital Expenditures	-$185.0M	-$169.0M	-$162.0M
Free Cash Flow	$418.0M	$349.0M	$517.0M
YoY Change	19.77%	-32.5%	92.19%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3000000	USD
CY2017Q4	alk	Airline Capacity Purchase Arrangements Carriers AirlineCapacityPurchaseArrangementsCarriers	3	carriers
CY2016Q4	alk	Deferred Revenue Mileage Plan Awards Issued But Not Yet Flown DeferredRevenueMileagePlanAwardsIssuedButNotYetFlown	43000000	USD
CY2017Q4	alk	Deferred Revenue Mileage Plan Awards Issued But Not Yet Flown DeferredRevenueMileagePlanAwardsIssuedButNotYetFlown	47000000	USD
CY2016Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	310000000	USD
CY2017Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	208000000	USD
CY2015	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	-15000000	USD
CY2016	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	13000000	USD
CY2017	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	9000000	USD
CY2015	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	490000000	USD
CY2016	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	514000000	USD
CY2017	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	453000000	USD
CY2017Q4	alk	Line Of Credit Facility Number Of Credit Facilities LineOfCreditFacilityNumberOfCreditFacilities	3	credit_facility
CY2017	alk	Numberof Defined Contribution Plans NumberofDefinedContributionPlans	7	plan
CY2017	alk	Numberof Non Qualified Defined Benefit Plans NumberofNonQualifiedDefinedBenefitPlans	1	plan
CY2017	alk	Numberof Qualified Defined Benefit Plans NumberofQualifiedDefinedBenefitPlans	4	plan
CY2015	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	3346000000	USD
CY2016	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	3751000000	USD
CY2017	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	5226000000	USD
CY2015	alk	Other Netand Special Revenue OtherNetandSpecialRevenue	697000000	USD
CY2016	alk	Other Netand Special Revenue OtherNetandSpecialRevenue	817000000	USD
CY2017	alk	Other Netand Special Revenue OtherNetandSpecialRevenue	1001000000	USD
CY2015	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	35000000	USD
CY2016	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	24000000	USD
CY2017	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	16000000	USD
CY2017	alk	Quarterly Payout To Employee Under Employee Incentive Plan Maximum QuarterlyPayoutToEmployeeUnderEmployeeIncentivePlanMaximum	300
CY2015	alk	Regional Carrier Expense RegionalCarrierExpense	72000000	USD
CY2016	alk	Regional Carrier Expense RegionalCarrierExpense	95000000	USD
CY2017	alk	Regional Carrier Expense RegionalCarrierExpense	121000000	USD
CY2017Q4	alk	Secured Debt Numberof Aircrafts Securing Debt Financing SecuredDebtNumberofAircraftsSecuringDebtFinancing	113	aircraft
CY2017Q4	alk	Secured Debt Numberof Spare Engines Securing Debt Financing SecuredDebtNumberofSpareEnginesSecuringDebtFinancing	2	aircraft
CY2015	alk	Special Tax Expense Benefit SpecialTaxExpenseBenefit	-26000000	USD
CY2016	alk	Special Tax Expense Benefit SpecialTaxExpenseBenefit	17000000	USD
CY2017	alk	Special Tax Expense Benefit SpecialTaxExpenseBenefit	-280000000	USD
CY2015	alk	Specialitemsother Specialitemsother	32000000	USD
CY2017	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	391000000	USD
CY2015	us-gaap	Aircraft Rental AircraftRental	105000000	USD
CY2016	us-gaap	Aircraft Rental AircraftRental	114000000	USD
CY2017	us-gaap	Aircraft Rental AircraftRental	274000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17000000	USD
CY2017	alk	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Asset Income Tax Expense TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxAssetIncomeTaxExpense	280000000	USD
CY2016Q4	alk	Travel Credits For Future Travel TravelCreditsForFutureTravel	62000000	USD
CY2017Q4	alk	Travel Credits For Future Travel TravelCreditsForFutureTravel	106000000	USD
CY2015	alk	Variable Incentive Compensation VariableIncentiveCompensation	120000000	USD
CY2016	alk	Variable Incentive Compensation VariableIncentiveCompensation	127000000	USD
CY2017	alk	Variable Incentive Compensation VariableIncentiveCompensation	135000000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000766421
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	122996587	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2016Q2	dei	Entity Public Float EntityPublicFloat	11100000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	ALASKA AIR GROUP, INC.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	92000000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	120000000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	878000000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	918000000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2929000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2991000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-5000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-3000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	1000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	299000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	376000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-305000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-380000000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	110000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	164000000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17000000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	19000000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	34000000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	55000000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	61000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	91000000	USD
CY2015	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	253000000	USD
CY2016	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	270000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	34000000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2016Q4	us-gaap	Assets Assets	9962000000	USD
CY2017Q4	us-gaap	Assets Assets	10740000000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	2050000000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	2146000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1400000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1435000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1252000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1427000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	113000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	113000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	50000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	50000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	1272000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	1264000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1175000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	962000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1388000000	USD
CY2016Q4	us-gaap	Bank Overdrafts BankOverdrafts	15000000	USD
CY2017Q4	us-gaap	Bank Overdrafts BankOverdrafts	10000000	USD
CY2016Q4	us-gaap	Business Acquisitions Purchase Price Allocation Subsequent Years Remaining Adjustments BusinessAcquisitionsPurchasePriceAllocationSubsequentYearsRemainingAdjustments	4000000	USD
CY2017Q4	us-gaap	Business Acquisitions Purchase Price Allocation Subsequent Years Remaining Adjustments BusinessAcquisitionsPurchasePriceAllocationSubsequentYearsRemainingAdjustments	3000000	USD
CY2016	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	117000000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	118000000	USD
CY2015	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	108000000	USD
CY2016	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	108000000	USD
CY2017	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	114000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	107000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	73000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	328000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	194000000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-34000000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	255000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-134000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	1580000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	1621000000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.80
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CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
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CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129189634	shares
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CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	123328051	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	123060638	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	855000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	812000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	959000000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	397000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	392000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	127000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	427000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	440000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	162000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	30000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	48000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	35000000	USD
CY2016Q4	us-gaap	Debt Current DebtCurrent	319000000	USD
CY2017Q4	us-gaap	Debt Current DebtCurrent	307000000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2581000000	USD
CY2017	us-gaap	Debt Instrument Increase Decrease For Period Net DebtInstrumentIncreaseDecreaseForPeriodNet	-395000000	USD
CY2016Q4	us-gaap	Deferred Air Traffic Revenue DeferredAirTrafficRevenue	849000000	USD
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CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1021000000	USD
CY2016Q4	us-gaap	Deferred Revenue DeferredRevenue	640000000	USD
CY2017Q4	us-gaap	Deferred Revenue DeferredRevenue	699000000	USD
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CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	289000000	USD
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CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	62000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	57000000	USD
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CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	463000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	454000000	USD
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CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	14000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	463000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	454000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	26000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	43000000	USD
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CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	964000000	USD
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CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	103000000	USD
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CY2017Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	494000000	USD
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CY2015	us-gaap	Dividends Cash DividendsCash	102000000	USD
CY2016	us-gaap	Dividends Cash DividendsCash	136000000	USD
CY2017	us-gaap	Dividends Cash DividendsCash	148000000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.61
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.59
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.39
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.56
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.54
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.35
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.354
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	397000000	USD
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CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	37000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y8M12D
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CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	13000000	USD
CY2016Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	16000000	USD
CY2017Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	23000000	USD
CY2016Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	6947000000	USD
CY2017Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	7559000000	USD
CY2015	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	113000000	USD
CY2016	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	126000000	USD
CY2017	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	195000000	USD
CY2015	us-gaap	Fuel Costs FuelCosts	954000000	USD
CY2016	us-gaap	Fuel Costs FuelCosts	831000000	USD
CY2017	us-gaap	Fuel Costs FuelCosts	1447000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	1934000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	1943000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1312000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1345000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1207000000	USD
CY2015Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0	USD
CY2016Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	3000000	USD
CY2017Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	5000000	USD
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CY2016	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	3000000	USD
CY2017	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	2000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	464000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	531000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	173000000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-280000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	459000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	471000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	422000000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	4000000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	20000000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	5000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-3000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-12000000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	19000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	28000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	29000000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	349000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	459000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	177000000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-47000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	46000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	39000000	USD
CY2015	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	38000000	USD
CY2016	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	9000000	USD
CY2017	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	88000000	USD
CY2015	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-56000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-94000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-19000000	USD
CY2015	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	57000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	83000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	63000000	USD
CY2015	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	36000000	USD
CY2016	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	23000000	USD
CY2017	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	17000000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	143000000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	133000000	USD
CY2015	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	34000000	USD
CY2016	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	25000000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	17000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	42000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	55000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	103000000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	8000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	24000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	84000000	USD
CY2016Q4	us-gaap	Inventory Net InventoryNet	47000000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	57000000	USD
CY2016Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	36000000	USD
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	38000000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	21000000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	27000000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	34000000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1254000000	USD
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CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1924000000	USD
CY2015	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	296000000	USD
CY2016	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	320000000	USD
CY2017	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	460000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	295000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	315000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	552000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	9962000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	10740000000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2535000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2700000000	USD
CY2016Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1851000000	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	2057000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	475000000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	2964000000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	2569000000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	319000000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	307000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	768000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	310000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	247000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	414000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	449000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	393000000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2645000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2262000000	USD
CY2016Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.044
CY2017Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.042
CY2016Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.024
CY2017Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.028
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-688000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1491000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-592000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-930000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2622000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1132000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1584000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1386000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1590000000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	848000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	814000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1034000000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	14000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-53000000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	4300000000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	4582000000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	6673000000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	1298000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1349000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1260000000	USD
CY2016Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	4000000	USD
CY2017Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	2246000000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	2310000000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	169000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	234000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-5000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	8000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	4000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	5000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	2000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-75000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-10000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	43000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	123000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-10000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	11000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	77000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-14000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	12000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	24000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1000000	USD
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CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1000000	USD
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CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	451000000	USD
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CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1000000	USD
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CY2016	us-gaap	Passenger Revenue Regional PassengerRevenueRegional	908000000	USD
CY2017	us-gaap	Passenger Revenue Regional PassengerRevenueRegional	960000000	USD
CY2015	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	681000000	USD
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CY2015	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	17000000	USD
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CY2017	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	12000000	USD
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CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-75000000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	505000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	193000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	75000000	USD
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	102000000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	136000000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	148000000	USD
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1951000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2015	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1327000000	USD
CY2016	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	960000000	USD
CY2017	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1569000000	USD
CY2015	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	79000000	USD
CY2016	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	53000000	USD
CY2017	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	96000000	USD
CY2015	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	71000000	USD
CY2016	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	97000000	USD
CY2017	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	126000000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	831000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	678000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1026000000	USD
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	331000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	453000000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	121000000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	127000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	2044000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	35000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	25000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	28000000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1175000000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	962000000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1388000000	USD
CY2015	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	214000000	USD
CY2016	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	247000000	USD
CY2017	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	314000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8595000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9275000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5666000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6284000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1103000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1222000000	USD
CY2016Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	302000000	USD
CY2017Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	341000000	USD
CY2017	us-gaap	Repayments Of Debt RepaymentsOfDebt	74000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	116000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	249000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	397000000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3568000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4454000000	USD
CY2015	us-gaap	Revenues Revenues	0	USD
CY2016	us-gaap	Revenues Revenues	0	USD
CY2017	us-gaap	Revenues Revenues	0	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	5598000000	USD
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	5931000000	USD
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	7933000000	USD
CY2015	us-gaap	Selling Expense SellingExpense	211000000	USD
CY2016	us-gaap	Selling Expense SellingExpense	225000000	USD
CY2017	us-gaap	Selling Expense SellingExpense	357000000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	25000000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	26000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	55000000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	17000000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10927824	shares
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	13000000	USD
CY2016	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	17000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	24000000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6000000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-4000000	USD
CY2015	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	7208328	shares
CY2016	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	2594809	shares
CY2017	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	981277	shares
CY2015	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	505000000	USD
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	193000000	USD
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	75000000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	2127000000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	2411000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	2931000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3721000000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5861583	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6842860	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	443000000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	518000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	32000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	43000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	11000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	8000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	29000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	16000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	3000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	36000000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129372000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	124389000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	123854000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	128373000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	123557000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	123211000	shares
CY2017	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Selling Expenses</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Selling expenses include credit card fees, global distribution systems charges, the estimated cost of frequent flyer travel awards earned through air travel, advertising, promotional costs, commissions and incentives. Advertising production costs are expensed as incurred.</font></div></div>
CY2017	us-gaap	Revenue Recognition Deferred Revenue RevenueRecognitionDeferredRevenue	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Deferred Revenue</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Deferred revenue results primarily from the sale of Mileage Plan™ miles to third-parties. It also includes Virgin America's Elevate® flown points outstanding at the acquisition date that were recorded at their estimated fair value as part of purchase price accounting. Recognition of this deferred revenue occurs when award transportation is provided or over the term of the applicable agreement.</font></div></div>

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$ALK
ALASKA AIR GROUP, INC. Stock $alk

2017 Q4 Form 10-K Financial Statement

#000076642118000015 Filed on February 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK ALASKA AIR GROUP, INC. Stock $alk

2017 Q4 Form 10-K Financial Statement

#000076642118000015 Filed on February 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK
ALASKA AIR GROUP, INC. Stock $alk