$ALK
ALASKA AIR GROUP, INC. Stock $alk

$alk Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000076642121000018 Filed on February 26, 2021

Income Statement

Concept	2020	2019 Q4	2018 Q4
Revenue	$3.566B	$2.228B	$2.064B
YoY Change	-59.39%	7.95%	6.28%
Cost Of Revenue	$2.140B	$969.0M	$1.003B
YoY Change	-44.39%	-3.39%	13.85%
Gross Profit	$1.426B	$1.259B	$1.061B
YoY Change	-71.09%	18.66%	0.0%
Gross Profit Margin	39.99%	56.51%	51.41%
Selling, General & Admin	$2.303B	$753.0M	$685.0M
YoY Change	-19.08%	9.93%	3.47%
% of Gross Profit	161.5%	59.81%	64.56%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$420.0M	$106.0M	$108.0M
YoY Change	-0.71%	-1.85%	11.34%
% of Gross Profit	29.45%	8.42%	10.18%
Operating Expenses	$5.341B	$1.007B	$942.0M
YoY Change	-30.8%	6.9%	4.67%
Operating Profit	-$1.775B	$252.0M	$119.0M
YoY Change	-266.98%	111.76%	-26.09%
Interest Expense	$98.00M	$2.000M	-$40.00M
YoY Change	25.64%	-105.0%	471.43%
% of Operating Profit		0.79%	-33.61%
Other Income/Expense, Net	-$65.00M	-$6.000M	-$3.000M
YoY Change	38.3%	100.0%	-250.0%
Pretax Income	-$1.840B	$243.0M	$36.00M
YoY Change	-281.1%	575.0%	-71.43%
Income Tax	-$516.0M	$62.00M	$13.00M
% Of Pretax Income		25.51%	36.11%
Net Earnings	-$1.324B	$181.0M	$23.00M
YoY Change	-272.17%	686.96%	-92.7%
Net Earnings / Revenue	-37.13%	8.12%	1.11%
Basic Earnings Per Share	-$10.72
Diluted Earnings Per Share	-$10.72	$1.448M	$184.7K
COMMON SHARES
Basic Shares Outstanding	123.5M shares	123.2M shares	123.3M shares
Diluted Shares Outstanding	123.5M shares

Balance Sheet

Concept	2020	2019 Q4	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.346B	$1.521B	$1.236B
YoY Change	119.99%	23.06%	-23.75%
Cash & Equivalents	$1.370B	$221.0M	$105.0M
Short-Term Investments	$1.976B	$1.300B	$1.131B
Other Short-Term Assets	$123.0M	$121.0M	$125.0M
YoY Change	1.65%	-3.2%	-6.02%
Inventory	$57.00M	$72.00M	$60.00M
Prepaid Expenses
Receivables	$480.0M	$323.0M	$366.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$4.006B	$2.037B	$1.787B
YoY Change	96.66%	13.99%	-16.96%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.611B	$6.902B	$6.781B
YoY Change	-11.63%	1.78%	7.91%
Goodwill		$1.943B	$1.943B
YoY Change		0.0%	0.0%
Intangibles		$122.0M	$127.0M
YoY Change		-3.94%	-4.51%
Long-Term Investments
YoY Change
Other Assets	$379.0M	$278.0M	$274.0M
YoY Change	37.82%	1.46%	17.09%
Total Long-Term Assets	$10.04B	$10.96B	$9.125B
YoY Change	-8.36%	20.07%	6.18%
TOTAL ASSETS
Total Short-Term Assets	$4.006B	$2.037B	$1.787B
Total Long-Term Assets	$10.04B	$10.96B	$9.125B
Total Assets	$14.05B	$12.99B	$10.91B
YoY Change	8.1%	19.07%	1.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$108.0M	$146.0M	$132.0M
YoY Change	-26.03%	10.61%	10.0%
Accrued Expenses	$1.241B	$431.0M	$416.0M
YoY Change	6.52%	3.61%	4.0%
Deferred Revenue		$900.0M	$788.0M
YoY Change		14.21%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$1.138B	$235.0M	$486.0M
YoY Change	384.26%	-51.65%	58.31%
Total Short-Term Liabilities	$4.293B	$3.201B	$2.942B
YoY Change	34.11%	8.8%	9.53%
LONG-TERM LIABILITIES
Long-Term Debt	$2.357B	$1.264B	$1.617B
YoY Change	86.47%	-21.83%	-28.51%
Other Long-Term Liabilities	$4.001B	$232.0M	$418.0M
YoY Change	14.91%	-44.5%	-1.65%
Total Long-Term Liabilities	$6.358B	$4.197B	$2.602B
YoY Change	33.97%	61.3%	11.29%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.293B	$3.201B	$2.942B
Total Long-Term Liabilities	$6.358B	$4.197B	$2.602B
Total Liabilities	$11.06B	$7.398B	$5.544B
YoY Change	27.66%	33.44%	10.35%
SHAREHOLDERS EQUITY
Retained Earnings		$5.133B	$4.534B
YoY Change		13.21%	8.13%
Common Stock		$306.0M	$233.0M
YoY Change		31.33%	41.21%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$643.0M	$568.0M
YoY Change		13.2%	9.65%
Treasury Stock Shares		8.812M shares	7.619M shares
Shareholders Equity	$2.988B	$4.331B	$3.751B
YoY Change
Total Liabilities & Shareholders Equity	$14.05B	$12.99B	$10.91B
YoY Change	8.1%	19.07%	1.54%

Cashflow Statement

Concept	2020	2019 Q4	2018 Q4
OPERATING ACTIVITIES
Net Income	-$1.324B	$181.0M	$23.00M
YoY Change	-272.17%	686.96%	-92.7%
Depreciation, Depletion And Amortization	$420.0M	$106.0M	$108.0M
YoY Change	-0.71%	-1.85%	11.34%
Cash From Operating Activities	-$234.0M	$341.0M	$209.0M
YoY Change	-113.59%	63.16%	-10.3%
INVESTING ACTIVITIES
Capital Expenditures	$222.0M	-$169.0M	-$406.0M
YoY Change	-68.1%	-58.37%	119.46%
Acquisitions
YoY Change
Other Investing Activities	$6.000M	$86.00M	$108.0M
YoY Change	-146.15%	-20.37%	-45.45%
Cash From Investing Activities	-$593.0M	-$83.00M	-$298.0M
YoY Change	-25.03%	-72.15%	-2392.31%
FINANCING ACTIVITIES
Cash Dividend Paid	$45.00M
YoY Change	-73.99%
Common Stock Issuance & Retirement, Net	$31.00M
YoY Change	-58.67%
Debt Paid & Issued, Net	$565.0M
YoY Change	-46.6%
Cash From Financing Activities	$1.981B	-275.0M	19.00M
YoY Change	-343.67%	-1547.37%	-109.84%
NET CHANGE
Cash From Operating Activities	-$234.0M	341.0M	209.0M
Cash From Investing Activities	-$593.0M	-83.00M	-298.0M
Cash From Financing Activities	$1.981B	-275.0M	19.00M
Net Change In Cash	$1.154B	-17.00M	-70.00M
YoY Change	877.97%	-75.71%	-232.08%
FREE CASH FLOW
Cash From Operating Activities	-$234.0M	$341.0M	$209.0M
Capital Expenditures	$222.0M	-$169.0M	-$406.0M
Free Cash Flow	-$456.0M	$510.0M	$615.0M
YoY Change	-144.44%	-17.07%	47.13%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000766421
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	124226396	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020	alk	Percentof Mileage Breakage PercentofMileageBreakage	0.174
CY2019	alk	Percentof Mileage Breakage PercentofMileageBreakage	0.174
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-8957
CY2020	dei	Entity Registrant Name EntityRegistrantName	ALASKA AIR GROUP, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	91-1292054
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	19300 International Boulevard
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Seattle
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98188
CY2020	dei	City Area Code CityAreaCode	206
CY2020	dei	Local Phone Number LocalPhoneNumber	392-5040
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 Par Value
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Trading Symbol TradingSymbol	ALK
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	4500000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1370000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1976000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1300000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	3346000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	1521000000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	480000000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	323000000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	57000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	72000000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	123000000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	121000000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	4006000000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	2037000000	USD
CY2020Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	7761000000	USD
CY2019Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	8549000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1398000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1306000000	USD
CY2020Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	583000000	USD
CY2019Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	533000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9742000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10388000000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3531000000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3486000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6211000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6902000000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1400000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1711000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1943000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1943000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	107000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	122000000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	379000000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	278000000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	3829000000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	4054000000	USD
CY2020Q4	us-gaap	Assets Assets	14046000000	USD
CY2019Q4	us-gaap	Assets Assets	12993000000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	108000000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	146000000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	527000000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	470000000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	424000000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	431000000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	290000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	269000000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	1138000000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	235000000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	4293000000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3201000000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2357000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1264000000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1268000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1439000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	407000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	715000000	USD
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	1544000000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	1240000000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	665000000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	571000000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	524000000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	232000000	USD
CY2020Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	4408000000	USD
CY2019Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	4197000000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	391000000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	305000000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	674000000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	643000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-494000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-465000000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3764000000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5133000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2988000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4331000000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14046000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12993000000	USD
CY2020	us-gaap	Revenues Revenues	3566000000	USD
CY2019	us-gaap	Revenues Revenues	8781000000	USD
CY2018	us-gaap	Revenues Revenues	8264000000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	2053000000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	2370000000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	2190000000	USD
CY2020	alk	Payroll Support Program Grant Recognized PayrollSupportProgramGrantRecognized	-782000000	USD
CY2019	alk	Payroll Support Program Grant Recognized PayrollSupportProgramGrantRecognized	0	USD
CY2020	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	181000000	USD
CY2018	alk	Payroll Support Program Grant Recognized PayrollSupportProgramGrantRecognized	0	USD
CY2020	alk	Variable Incentive Compensation VariableIncentiveCompensation	130000000	USD
CY2019	alk	Variable Incentive Compensation VariableIncentiveCompensation	163000000	USD
CY2018	alk	Variable Incentive Compensation VariableIncentiveCompensation	147000000	USD
CY2020	us-gaap	Fuel Costs FuelCosts	723000000	USD
CY2019	us-gaap	Fuel Costs FuelCosts	1878000000	USD
CY2018	us-gaap	Fuel Costs FuelCosts	1936000000	USD
CY2020	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	321000000	USD
CY2019	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	437000000	USD
CY2018	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	435000000	USD
CY2020	us-gaap	Aircraft Rental AircraftRental	299000000	USD
CY2019	us-gaap	Aircraft Rental AircraftRental	331000000	USD
CY2018	us-gaap	Aircraft Rental AircraftRental	315000000	USD
CY2020	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	417000000	USD
CY2019	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	531000000	USD
CY2018	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	499000000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	572000000	USD
CY2019	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	289000000	USD
CY2018	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	306000000	USD
CY2020	us-gaap	Selling Expense SellingExpense	101000000	USD
CY2019	us-gaap	Selling Expense SellingExpense	313000000	USD
CY2018	us-gaap	Selling Expense SellingExpense	326000000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	420000000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	423000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	398000000	USD
CY2020	us-gaap	Cost Of Services Catering CostOfServicesCatering	90000000	USD
CY2019	us-gaap	Cost Of Services Catering CostOfServicesCatering	214000000	USD
CY2018	us-gaap	Cost Of Services Catering CostOfServicesCatering	211000000	USD
CY2020	alk	Regional Carrier Expense RegionalCarrierExpense	128000000	USD
CY2019	alk	Regional Carrier Expense RegionalCarrierExpense	166000000	USD
CY2018	alk	Regional Carrier Expense RegionalCarrierExpense	154000000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	407000000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	559000000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	6000000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	44000000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	87000000	USD
CY2020	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	627000000	USD
CY2019	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	0	USD
CY2018	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	0	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	220000000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2020	alk	Specialitemsother Specialitemsother	0	USD
CY2019	alk	Specialitemsother Specialitemsother	0	USD
CY2018	alk	Specialitemsother Specialitemsother	45000000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	5341000000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	7718000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	7621000000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-1775000000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1063000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	643000000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	31000000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	42000000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	38000000	USD
CY2020	us-gaap	Interest Expense InterestExpense	98000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	78000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	91000000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	11000000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	15000000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	18000000	USD
CY2020	alk	Special Items Net Non Operating SpecialItemsNetNonOperating	-26000000	USD
CY2019	alk	Special Items Net Non Operating SpecialItemsNetNonOperating	0	USD
CY2018	alk	Special Items Net Non Operating SpecialItemsNetNonOperating	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-26000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-23000000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-65000000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-47000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-58000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1840000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1016000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	585000000	USD
CY2020	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	-516000000	USD
CY2019	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	247000000	USD
CY2018	alk	Income Tax Expense Benefit Before Tax Cutsand Jobs Actof2017 IncomeTaxExpenseBenefitBeforeTaxCutsandJobsActof2017	148000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1324000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	769000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	437000000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-10.72
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.24
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-10.72
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.19
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	123450000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	123279000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	123230000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	123450000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	124289000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	123975000	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1324000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	769000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	437000000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	33000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	31000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-14000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	14000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	5000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-8000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	5000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	6000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	14000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	20000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-4000000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	69000000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	71000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	34000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	30000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	32000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	28000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	10000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	10000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-29000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-29000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-21000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-3000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-3000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-4000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	1000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-14000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-8000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1353000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	752000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	431000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3460000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	437000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6000000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	50000000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	36000000	USD
CY2018	us-gaap	Dividends Cash DividendsCash	158000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	35000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3751000000	USD
CY2019	alk	Tax Cutsand Jobs Act Reclassificationfrom Aoc Ito Retained Earnings Tax Effect TaxCutsandJobsActReclassificationfromAOCItoRetainedEarningsTaxEffect	3000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	769000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	75000000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	36000000	USD
CY2019	us-gaap	Dividends Cash DividendsCash	173000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	40000000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4331000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1324000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29000000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	31000000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	34000000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	14000000	USD
CY2020	us-gaap	Dividends Cash DividendsCash	45000000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	41000000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2988000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1324000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	769000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	437000000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	420000000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	423000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	398000000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	24000000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	29000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	47000000	USD
CY2020	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	627000000	USD
CY2019	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	0	USD
CY2018	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	0	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	220000000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	300000000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-209000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-146000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	160000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-43000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	25000000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	173000000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	112000000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-18000000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	288000000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	116000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	149000000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-202000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	86000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	61000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-234000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1722000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1195000000	USD
CY2020	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	64000000	USD
CY2019	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	356000000	USD
CY2018	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	686000000	USD
CY2020	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	55000000	USD
CY2019	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	178000000	USD
CY2018	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	105000000	USD
CY2020	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	87000000	USD
CY2019	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	162000000	USD
CY2018	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	169000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	206000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	696000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	960000000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	2962000000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1810000000	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	834000000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	2318000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1674000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1116000000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	279000000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	28000000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	16000000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	22000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-13000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-31000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-593000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-791000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-631000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	2564000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	450000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	339000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	565000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1058000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	807000000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	31000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	75000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50000000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	45000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	173000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	158000000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	58000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	43000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	29000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1981000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-813000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-647000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1154000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	118000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-83000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	232000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	114000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	197000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1386000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	232000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	114000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	50000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	60000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	72000000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	31000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1370000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	105000000	USD
CY2020Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	16000000	USD
CY2019Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	11000000	USD
CY2018Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	9000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1386000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	232000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	114000000	USD
CY2020Q4	us-gaap	Bank Overdrafts BankOverdrafts	5000000	USD
CY2019Q4	us-gaap	Bank Overdrafts BankOverdrafts	7000000	USD
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	46000000	USD
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	41000000	USD
CY2020Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	15000000	USD
CY2019Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	28000000	USD
CY2020Q4	alk	Aircraft Maintenance Deposits AircraftMaintenanceDeposits	242000000	USD
CY2019Q4	alk	Aircraft Maintenance Deposits AircraftMaintenanceDeposits	143000000	USD
CY2020Q4	alk	Lease Return Provision Current LeaseReturnProvisionCurrent	-54000000	USD
CY2020Q4	alk	Lease Return Provision Non Current LeaseReturnProvisionNonCurrent	-246000000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	41000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	72000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	79000000	USD
CY2020Q4	alk	Number Of Mainline Aircraft Parked NumberOfMainlineAircraftParked	32	aircraft
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	204000000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	154000000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	2000000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	3000000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	363000000	USD
CY2020	alk	Leased Aircraft Return Costs LeasedAircraftReturnCosts	209000000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	10	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	220000000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	127000000	USD
CY2020	alk	Aircraft Purchase Deposit Write Off AircraftPurchaseDepositWriteOff	15000000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	5000000	USD
CY2020	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	627000000	USD
CY2020Q4	alk	Total Expected Relief From Psp Of Cares Act TotalExpectedReliefFromPSPOfCARESAct	1100000000	USD
CY2020Q4	alk	Unsecured Term Loan Through Psp Of Cares Act UnsecuredTermLoanThroughPSPOfCARESAct	290000000	USD
CY2020	alk	Proceeds From Payroll Support Program Grant ProceedsFromPayrollSupportProgramGrant	753000000	USD
CY2020	alk	Proceeds From Payroll Support Program Grant ProceedsFromPayrollSupportProgramGrant	753000000	USD
CY2020	alk	Cares Act Payroll Tax Relief CARESActPayrollTaxRelief	29000000	USD
CY2020Q4	us-gaap	Credit Card Receivables CreditCardReceivables	83000000	USD
CY2019Q4	us-gaap	Credit Card Receivables CreditCardReceivables	212000000	USD
CY2020	alk	Numberof Partner A Irlines NumberofPartnerAIrlines	17	agreement
CY2020	alk	Percentof Mileage Breakage PercentofMileageBreakage	0.174
CY2020	us-gaap	Deferred Revenue Refund Payments1 DeferredRevenueRefundPayments1	600000000	USD
CY2020	alk	Covid19 Related Credits Issued COVID19RelatedCreditsIssued	1000000000	USD
CY2020Q4	alk	Covid19 Credits Issued Balance COVID19CreditsIssuedBalance	569000000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	43000000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	208000000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	217000000	USD
CY2020	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	14000000	USD
CY2019	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	19000000	USD
CY2018	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-21000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1900000000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	2300000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1700000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1100000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	775000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	777000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	1146000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	1175000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	23000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	24000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1944000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1976000000	USD
CY2020Q4	alk	Unsecured Term Loan Through Psp Of Cares Act UnsecuredTermLoanThroughPSPOfCARESAct	290000000	USD
CY2019Q4	alk	Unsecured Term Loan Through Psp Of Cares Act UnsecuredTermLoanThroughPSPOfCARESAct	0	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	33000000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	3495000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1499000000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1138000000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	235000000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2357000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1264000000	USD
CY2020Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.043
CY2019Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.033
CY2020Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.019
CY2019Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.029
CY2020Q4	us-gaap	Longterm Debt Weighted Average Interest Rate LongtermDebtWeightedAverageInterestRate	0.033
CY2020	us-gaap	Debt Instrument Increase Decrease For Period Net DebtInstrumentIncreaseDecreaseForPeriodNet	2000000000.0	USD
CY2020	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	2600000000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	400000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	565000000	USD
CY2020	us-gaap	Repayments Of Debt RepaymentsOfDebt	314000000	USD
CY2020Q4	alk	Unsecured Term Loan Through Psp Of Cares Act UnsecuredTermLoanThroughPSPOfCARESAct	290000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1145000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	371000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	334000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	240000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	396000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1042000000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3528000000	USD
CY2020Q4	alk	Line Of Credit Facility Number Of Credit Facilities LineOfCreditFacilityNumberOfCreditFacilities	3	credit_facility
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	461000000	USD
CY2020Q4	alk	Line Of Credit Facility Number Of Credit Facilities LineOfCreditFacilityNumberOfCreditFacilities	3	credit_facility
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	400000000	USD
CY2020	us-gaap	Line Of Credit Facility Periodic Payment Principal LineOfCreditFacilityPeriodicPaymentPrincipal	37000000	USD
CY2020Q4	alk	Line Of Credit Facility Number Of Credit Facilities LineOfCreditFacilityNumberOfCreditFacilities	3	credit_facility
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1400000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1711000000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	14000000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	13000000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Lease Not Yet Commenced Assumption And Judgment Value Of Underlying Asset Amount LessorOperatingLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount	453000000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	602000000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	668000000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	14000000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	13000000	USD
CY2020	us-gaap	Lease Cost LeaseCost	588000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	655000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	619000000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	302000000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	81000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	58000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1589000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1723000000	USD
CY2020Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	385000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1126000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1233000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	15000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	16000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	342000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	416000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	106000000	USD
CY2019Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	337000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	17000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	15000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	215000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	179000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	27000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	13000000	USD
CY2020Q4	alk	Deferred Tax Assets Leasing Arrangement DeferredTaxAssetsLeasingArrangement	381000000	USD
CY2019Q4	alk	Deferred Tax Assets Leasing Arrangement DeferredTaxAssetsLeasingArrangement	417000000	USD
CY2020Q4	alk	Deferred Tax Assets Leasehold Maintenance DeferredTaxAssetsLeaseholdMaintenance	-73000000	USD
CY2019Q4	alk	Deferred Tax Assets Leasehold Maintenance DeferredTaxAssetsLeaseholdMaintenance	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	103000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	48000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1201000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1009000000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	19000000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	1000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	407000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	715000000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	19000000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-212000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	26000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-5000000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-11000000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9000000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-223000000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	39000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4000000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-246000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	175000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	125000000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-47000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	33000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	19000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-293000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	208000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	144000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-516000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	247000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	148000000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1840000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1016000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	585000000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-386000000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	213000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	123000000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	9000000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	9000000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	9000000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-62000000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	36000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21000000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-93000000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-9000000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-7000000	USD
CY2020	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	18000000	USD
CY2019	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	0	USD
CY2018	alk	Effective Income Tax Rate Reconciliation Stateand Local Income Sourcing Amount EffectiveIncomeTaxRateReconciliationStateandLocalIncomeSourcingAmount	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-2000000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-2000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-516000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	247000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	148000000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.280
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.243
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.253
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-9000000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-93000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	35000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	35000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	29000000	USD
CY2020Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	6000000	USD
CY2019Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	7000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	43000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	4000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2017Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	6000000	USD
CY2020	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	-1000000	USD
CY2019	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	1000000	USD
CY2018	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	1000000	USD
CY2020	alk	Numberof Qualified Defined Benefit Plans NumberofQualifiedDefinedBenefitPlans	4	plan
CY2020	alk	Numberof Non Qualified Defined Benefit Plans NumberofNonQualifiedDefinedBenefitPlans	1	plan
CY2020	alk	Numberof Defined Contribution Plans NumberofDefinedContributionPlans	7	plan
CY2020	alk	Numberof Qualified Defined Benefit Plans NumberofQualifiedDefinedBenefitPlans	4	plan
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	2207000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	1957000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1710000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1545000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	2207000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	1957000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	2057000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	1539000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1710000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1545000000	USD
CY2020	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	11000000	USD
CY2019	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	0	USD
CY2018	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	0	USD
CY2020	alk	Numberof Defined Contribution Plans NumberofDefinedContributionPlans	7	plan
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	126000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	132000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	126000000	USD
CY2020	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	130000000	USD
CY2019	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	163000000	USD
CY2018	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	147000000	USD
CY2020	alk	Quarterly Payout To Employee Under Employee Incentive Plan Maximum QuarterlyPayoutToEmployeeUnderEmployeeIncentivePlanMaximum	450	USD
CY2020	alk	Quarterly Payout To Employee Under Employee Incentive Plan Maximum QuarterlyPayoutToEmployeeUnderEmployeeIncentivePlanMaximum	450	USD
CY2020Q4	alk	Lax Redevelopment Project Total Expected Outlay LAXRedevelopmentProjectTotalExpectedOutlay	230000000	USD
	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	24000000	USD
	alk	Lax Construction Amount Reimbursed LAXConstructionAmountReimbursed	8700000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.375
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	45000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	173000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	158000000	USD
CY2020Q4	alk	Class Of Warrant Or Right Number Of Warrants Authorized ClassOfWarrantOrRightNumberOfWarrantsAuthorized	6099336	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	23000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	9000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	498000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	469000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-19000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-5000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-494000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-465000000	USD
CY2020	alk	Special Items Impairment Charges And Other SpecialItemsImpairmentChargesAndOther	627000000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	220000000	USD
CY2020	alk	Special Items Net Non Operating SpecialItemsNetNonOperating	-26000000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	44000000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	87000000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	370000000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	34000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	36000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	36000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9000000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	36000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y8M12D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	17000000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5893374	shares
CY2020	us-gaap	Revenues Revenues	3566000000	USD
CY2020	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	4618000000	USD
CY2020	us-gaap	Fuel Costs FuelCosts	723000000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	5341000000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-65000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1840000000	USD
CY2019	us-gaap	Revenues Revenues	8781000000	USD
CY2019	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	5840000000	USD
CY2019	us-gaap	Fuel Costs FuelCosts	1878000000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	7718000000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-47000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1016000000	USD
CY2018	us-gaap	Revenues Revenues	8264000000	USD
CY2018	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	5685000000	USD
CY2018	us-gaap	Fuel Costs FuelCosts	1936000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	7621000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-58000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	585000000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	420000000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	423000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	398000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	206000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	696000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	960000000	USD
CY2020Q4	us-gaap	Assets Assets	14046000000	USD
CY2019Q4	us-gaap	Assets Assets	12993000000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5893374	shares

Files In Submission

Name	View Source	Status
0000766421-21-000018-index-headers.html	Edgar Link	pending
0000766421-21-000018-index.html	Edgar Link	pending
0000766421-21-000018.txt	Edgar Link	pending
0000766421-21-000018-xbrl.zip	Edgar Link	pending
a41-warrantxxpsp2xxalaskaa.htm	Edgar Link	pending
alk-20201231.htm	Edgar Link	pending
alk-20201231.xsd	Edgar Link	pending
alk-20201231_cal.xml	Edgar Link	unprocessable
alk-20201231_def.xml	Edgar Link	unprocessable
alk-20201231_g1.jpg	Edgar Link	pending
alk-20201231_htm.xml	Edgar Link	completed
alk-20201231_lab.xml	Edgar Link	unprocessable
alk-20201231_pre.xml	Edgar Link	unprocessable
alk10-k12312020ex21.htm	Edgar Link	pending
alk10-k12312020ex231.htm	Edgar Link	pending
alk10-k12312020ex311.htm	Edgar Link	pending
alk10-k12312020ex312.htm	Edgar Link	pending
alk10-k12312020ex321.htm	Edgar Link	pending
alk10-k12312020ex322.htm	Edgar Link	pending
ex1019payrollsupportagreem.htm	Edgar Link	pending
ex1020-horizonjoinderxxpsp.htm	Edgar Link	pending
ex1021-ustxpsp2xxalaskaxar.htm	Edgar Link	pending
ex1022-alk_nsox2016pip1105.htm	Edgar Link	pending
ex1023-alk_isox2016pip1105.htm	Edgar Link	pending
ex1024-alk_psux2016pip1105.htm	Edgar Link	pending
ex1025-alk_formxagmtxrsux2.htm	Edgar Link	pending
ex42-ustxpsp2xxmcgeexwarra.htm	Edgar Link	pending
ex43-ustxpsp2xxalaskaxwarr.htm	Edgar Link	pending
ex44-ustxpsp2xxalaskaxarno.htm	Edgar Link	pending
exhibit101ala-boeingctrxag.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image_01b.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ALK
ALASKA AIR GROUP, INC. Stock $alk

2020 Form 10-K Financial Statement

#000076642121000018 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK ALASKA AIR GROUP, INC. Stock $alk

2020 Form 10-K Financial Statement

#000076642121000018 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK
ALASKA AIR GROUP, INC. Stock $alk