$LUV
SOUTHWEST AIRLINES CO Stock $luv

$luv Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000009238021000101 Filed on April 27, 2021

Income Statement

Concept	2021 Q1	2020 Q1
Revenue	$2.052B	$4.234B
YoY Change	-51.54%	-17.77%
Cost Of Revenue	$782.0M	$1.209B
YoY Change	-35.32%	-10.31%
Gross Profit	$1.270B	$3.025B
YoY Change	-58.02%	-20.42%
Gross Profit Margin	61.89%	71.45%
Selling, General & Admin	$1.744B	$2.126B
YoY Change	-17.97%	-6.34%
% of Gross Profit	137.32%	70.28%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$312.0M	$311.0M
YoY Change	0.32%	4.71%
% of Gross Profit	24.57%	10.28%
Operating Expenses	$2.519B	$3.135B
YoY Change	-19.65%	-32.49%
Operating Profit	$199.0M	-$110.0M
YoY Change	-280.91%	-121.78%
Interest Expense	-$101.0M	-$6.000M
YoY Change	1583.33%	-119.35%
% of Operating Profit	-50.75%
Other Income/Expense, Net	-$53.00M	-$34.00M
YoY Change	55.88%	3300.0%
Pretax Income	$146.0M	-$144.0M
YoY Change	-201.39%	-128.57%
Income Tax	$30.00M	-$50.00M
% Of Pretax Income	20.55%
Net Earnings	$116.0M	-$94.00M
YoY Change	-223.4%	-124.29%
Net Earnings / Revenue	5.65%	-2.22%
Basic Earnings Per Share	$0.20	-$0.18
Diluted Earnings Per Share	$0.19	-$0.18
COMMON SHARES
Basic Shares Outstanding	591.0M shares	515.0M shares
Diluted Shares Outstanding	609.0M shares	515.0M shares

Balance Sheet

Concept	2021 Q1	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$14.35B	$5.545B
YoY Change	158.76%	43.62%
Cash & Equivalents	$11.97B	$3.940B
Short-Term Investments	$2.377B	$1.605B
Other Short-Term Assets	$367.0M	$256.0M
YoY Change	43.36%	-27.68%
Inventory	$448.0M	$518.0M
Prepaid Expenses
Receivables	$132.0M	$579.0M
Other Receivables	$8.000M	$38.00M
Total Short-Term Assets	$16.10B	$7.028B
YoY Change	129.08%	28.18%
LONG-TERM ASSETS
Property, Plant & Equipment	$15.65B	$16.99B
YoY Change	-7.89%	-4.41%
Goodwill	$970.0M	$970.0M
YoY Change	0.0%	0.0%
Intangibles	$295.0M	$296.0M
YoY Change	-0.34%	-5.43%
Long-Term Investments
YoY Change
Other Assets	$743.0M	$620.0M
YoY Change	19.84%	-14.48%
Total Long-Term Assets	$19.39B	$19.86B
YoY Change	-2.34%	-5.33%
TOTAL ASSETS
Total Short-Term Assets	$16.10B	$7.028B
Total Long-Term Assets	$19.39B	$19.86B
Total Assets	$35.49B	$26.89B
YoY Change	32.02%	1.61%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.094B	$1.043B
YoY Change	4.89%	-26.13%
Accrued Expenses	$1.665B	$1.037B
YoY Change	60.56%	-23.19%
Deferred Revenue	$4.906B	$5.036B
YoY Change	-2.58%
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$225.0M	$2.795B
YoY Change	-91.95%	389.49%
Total Short-Term Liabilities	$8.182B	$10.24B
YoY Change	-20.11%	17.4%
LONG-TERM LIABILITIES
Long-Term Debt	$10.55B	$2.288B
YoY Change	360.93%	-12.07%
Other Long-Term Liabilities	$1.123B	$694.0M
YoY Change	61.82%	14.14%
Total Long-Term Liabilities	$1.123B	$694.0M
YoY Change	61.82%	14.14%
TOTAL LIABILITIES
Total Short-Term Liabilities	$8.182B	$10.24B
Total Long-Term Liabilities	$1.123B	$694.0M
Total Liabilities	$9.305B	$10.94B
YoY Change	-14.91%	17.19%
SHAREHOLDERS EQUITY
Retained Earnings	$14.91B	$17.76B
YoY Change	-16.02%	8.81%
Common Stock	$5.108B	$2.390B
YoY Change	113.72%	2.97%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$10.87B	$10.89B
YoY Change	-0.17%	21.69%
Treasury Stock Shares
Shareholders Equity	$9.093B	$9.075B
YoY Change
Total Liabilities & Shareholders Equity	$35.49B	$26.89B
YoY Change	32.02%	1.61%

Cashflow Statement

Concept	2021 Q1	2020 Q1
OPERATING ACTIVITIES
Net Income	$116.0M	-$94.00M
YoY Change	-223.4%	-124.29%
Depreciation, Depletion And Amortization	$312.0M	$311.0M
YoY Change	0.32%	4.71%
Cash From Operating Activities	$645.0M	-$377.0M
YoY Change	-271.09%	-134.12%
INVESTING ACTIVITIES
Capital Expenditures	-$95.00M	-$224.0M
YoY Change	-57.59%	40.0%
Acquisitions
YoY Change
Other Investing Activities	-$106.0M	$219.0M
YoY Change	-148.4%	-32.41%
Cash From Investing Activities	-$201.0M	-$5.000M
YoY Change	3920.0%	-103.05%
FINANCING ACTIVITIES
Cash Dividend Paid	$0.00	$188.0M
YoY Change	-100.0%	5.62%
Common Stock Issuance & Retirement, Net	$0.00	$451.0M
YoY Change	-100.0%	-9.8%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$464.0M	$1.774B
YoY Change	-73.84%	-327.73%
NET CHANGE
Cash From Operating Activities	$645.0M	-$377.0M
Cash From Investing Activities	-$201.0M	-$5.000M
Cash From Financing Activities	$464.0M	$1.774B
Net Change In Cash	$908.0M	$1.392B
YoY Change	-34.77%	184.08%
FREE CASH FLOW
Cash From Operating Activities	$645.0M	-$377.0M
Capital Expenditures	-$95.00M	-$224.0M
Free Cash Flow	$740.0M	-$153.0M
YoY Change	-583.66%	-112.09%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	luv	Cash Tax Refund Expected From Cares Act Loss Carry Back Provision CashTaxRefundExpectedFromCARESActLossCarryBackProvision	470000000	USD
CY2021Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000092380
CY2021Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2021Q1	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	luv	Proceeds From Payroll Support Program Grant Received In June2020 ProceedsFromPayrollSupportProgramGrantReceivedInJune2020	652000000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	199000000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-110000000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-94000000	USD
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	312000000	USD
CY2021Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	95000000	USD
CY2021Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	599000000	USD
CY2021Q1	dei	Document Type DocumentType	10-Q
CY2021Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q1	dei	Entity File Number EntityFileNumber	1-7259
CY2021Q1	dei	Entity Registrant Name EntityRegistrantName	SOUTHWEST AIRLINES CO.
CY2021Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	TX
CY2021Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	74-1563240
CY2021Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	P.O. Box 36611
CY2021Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Dallas,
CY2021Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2021Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75235-1611
CY2021Q1	dei	City Area Code CityAreaCode	214
CY2021Q1	dei	Local Phone Number LocalPhoneNumber	792-4000
CY2021Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2021Q1	dei	Entity Shell Company EntityShellCompany	false
CY2021Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	591376576	shares
CY2021Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11971000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11063000000	USD
CY2021Q1	us-gaap	Short Term Investments ShortTermInvestments	2377000000	USD
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	2271000000	USD
CY2021Q1	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	937000000	USD
CY2020Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	1130000000	USD
CY2021Q1	us-gaap	Airline Related Inventory AirlineRelatedInventory	448000000	USD
CY2020Q4	us-gaap	Airline Related Inventory AirlineRelatedInventory	414000000	USD
CY2021Q1	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	367000000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	295000000	USD
CY2021Q1	us-gaap	Assets Current AssetsCurrent	16100000000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	15173000000	USD
CY2021Q1	us-gaap	Flight Equipment Gross FlightEquipmentGross	20876000000	USD
CY2020Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	20877000000	USD
CY2021Q1	luv	Proceeds From Payroll Support Program Extension During First Quarter2021 ProceedsFromPayrollSupportProgramExtensionDuringFirstQuarter2021	1700000000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	6111000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	6083000000	USD
CY2021Q1	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	53000000	USD
CY2020Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	305000000	USD
CY2021Q1	luv	Assets Constructed For Others AssetsConstructedForOthers	341000000	USD
CY2020Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	309000000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	27381000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	27574000000	USD
CY2021Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11733000000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11743000000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	15648000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	15831000000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	970000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	970000000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	2032000000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1892000000	USD
CY2021Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	743000000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	722000000	USD
CY2021Q1	us-gaap	Assets Assets	35493000000	USD
CY2020Q4	us-gaap	Assets Assets	34588000000	USD
CY2021Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	1094000000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	931000000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1665000000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	2259000000	USD
CY2021Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	292000000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	306000000	USD
CY2021Q1	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	4906000000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3790000000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	225000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	220000000	USD
CY2021Q1	us-gaap	Liabilities Current LiabilitiesCurrent	8182000000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	7506000000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	10546000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	10111000000	USD
CY2021Q1	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	2826000000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	3343000000	USD
CY2021Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1660000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1634000000	USD
CY2021Q1	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	341000000	USD
CY2020Q4	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	309000000	USD
CY2021Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1722000000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1562000000	USD
CY2021Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1123000000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1247000000	USD
CY2021Q1	us-gaap	Common Stock Value CommonStockValue	888000000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	888000000	USD
CY2021Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4220000000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4191000000	USD
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CY2021Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-60000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-105000000	USD
CY2021Q1	us-gaap	Treasury Stock Value TreasuryStockValue	10867000000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	10875000000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	9093000000	USD
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CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2052000000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4234000000	USD
CY2021Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1571000000	USD
CY2020Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1854000000	USD
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CY2020Q1	luv	Payroll Support And Voluntary Employee Programs Net PayrollSupportAndVoluntaryEmployeeProgramsNet	0	USD
CY2021Q1	us-gaap	Fuel Costs FuelCosts	469000000	USD
CY2020Q1	us-gaap	Fuel Costs FuelCosts	870000000	USD
CY2021Q1	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	173000000	USD
CY2020Q1	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	272000000	USD
CY2021Q1	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	313000000	USD
CY2020Q1	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	339000000	USD
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	312000000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	311000000	USD
CY2021Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	463000000	USD
CY2020Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	698000000	USD
CY2021Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	1853000000	USD
CY2020Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	4344000000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	199000000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-110000000	USD
CY2021Q1	us-gaap	Interest Costs Incurred InterestCostsIncurred	114000000	USD
CY2020Q1	us-gaap	Interest Costs Incurred InterestCostsIncurred	28000000	USD
CY2021Q1	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	11000000	USD
CY2020Q1	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	5000000	USD
CY2021Q1	us-gaap	Investment Income Interest InvestmentIncomeInterest	2000000	USD
CY2020Q1	us-gaap	Investment Income Interest InvestmentIncomeInterest	17000000	USD
CY2021Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	48000000	USD
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CY2020Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-34000000	USD
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CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30000000	USD
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CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-94000000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
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CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	609000000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	515000000	shares
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	8876000000	USD
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CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	23000000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	180000000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	9093000000	USD
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CY2020Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	451000000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2000000	USD
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CY2020Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.180
CY2020Q1	us-gaap	Dividends Cash DividendsCash	94000000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-219000000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	9075000000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-94000000	USD
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	312000000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	311000000	USD
CY2021Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	7000000	USD
CY2020Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-2000000	USD
CY2021Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-5000000	USD
CY2020Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	49000000	USD
CY2021Q1	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	234000000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-183000000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	11000000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-58000000	USD
CY2021Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-66000000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-1291000000	USD
CY2021Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	599000000	USD
CY2020Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	701000000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-122000000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-132000000	USD
CY2021Q1	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	38000000	USD
CY2020Q1	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	-5000000	USD
CY2021Q1	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	15000000	USD
CY2020Q1	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-61000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	645000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-377000000	USD
CY2021Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	95000000	USD
CY2020Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	224000000	USD
CY2021Q1	luv	Supplier Proceeds SupplierProceeds	0	USD
CY2020Q1	luv	Supplier Proceeds SupplierProceeds	-300000000	USD
CY2021Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1324000000	USD
CY2020Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1029000000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1218000000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	948000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-201000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-5000000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	500000000	USD
CY2021Q1	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2020Q1	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	1000000000	USD
CY2021Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2020Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1000000000	USD
CY2021Q1	luv	Proceeds From Payroll Support Program Loans And Warrants ProceedsFromPayrollSupportProgramLoansAndWarrants	511000000	USD
CY2020Q1	luv	Proceeds From Payroll Support Program Loans And Warrants ProceedsFromPayrollSupportProgramLoansAndWarrants	0	USD
CY2021Q1	luv	Proceeds From Payroll Support Program ProceedsFromPayrollSupportProgram	3400000000	USD
CY2021Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	13000000	USD
CY2020Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	11000000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	451000000	USD
CY2021Q1	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	67000000	USD
CY2020Q1	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	78000000	USD
CY2021Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	0	USD
CY2020Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	188000000	USD
CY2021Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	7000000	USD
CY2020Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-20000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	464000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1774000000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	908000000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1392000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11063000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2548000000	USD
CY2021Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11971000000	USD
CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3940000000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	17000000	USD
CY2020Q1	us-gaap	Interest Paid Net InterestPaidNet	14000000	USD
CY2021Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	1000000	USD
CY2020Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	5000000	USD
CY2021Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	218000000	USD
CY2020Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	25000000	USD
CY2021Q1	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	32000000	USD
CY2020Q1	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	34000000	USD
CY2021Q1	us-gaap	Basis Of Accounting BasisOfAccounting	BASIS OF PRESENTATION<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">Southwest Airlines Co. (the "Company" or "Southwest") operates Southwest Airlines, a major passenger airline that provides scheduled air transportation in the United States and near-international markets. The unaudited Condensed Consolidated Financial Statements include accounts of the Company and its wholly owned subsidiaries.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The accompanying unaudited Condensed Consolidated Financial Statements of the Company and its subsidiaries have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles in the United States ("GAAP") for complete financial statements. The unaudited Condensed Consolidated Financial Statements for the interim periods ended March 31, 2021 and 2020 include all adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the interim periods. This includes all normal and recurring adjustments and elimination of significant intercompany transactions. Financial results for the Company and airlines in general can be seasonal in nature. In many years, the Company's revenues, as well as its Operating income and Net income, have been better in its second and third fiscal quarters than in its first and fourth fiscal quarters. However, beginning in early 2020, as a result of the COVID-19 pandemic, the Company's results have not been in line with such historical trends. See Note 2 for further information. Air travel is also significantly impacted by general economic conditions, the amount of disposable income available to consumers and changes in consumer behavior, unemployment levels, corporate travel budgets, global pandemics such as COVID-19, extreme or severe weather and natural disasters, fears of terrorism or war, governmental actions, and other factors beyond the Company's control. These and other factors, such as the price of jet fuel in some periods, the nature of the Company's fuel hedging program, and the periodic volatility of commodities used by the Company for hedging jet fuel, have created, and may continue to create, significant volatility in the Company's financial results. See Note 4 for further information on fuel and the Company's hedging program. Operating results for the three months ended March 31, 2021, are not necessarily indicative of the results that may be expected for future quarters or for the year ended December 31, 2021. For further information, refer to the Consolidated Financial Statements and footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">In the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss), for the three months ended March 31, 2021, Payroll support and voluntary Employee programs, net, includes the correction of previously underaccrued payroll tax credits, related to fourth quarter 2020, of $88 million, pre-tax. Other gains and losses, net, includes gains of $60 million, pre-tax, to correct investment gains related to prior periods previously recorded in Accumulated other comprehensive income (loss) ("AOCI"). </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">In the unaudited Condensed Consolidated Statement of Stockholders' Equity, for the three months ended March 31, 2021, the Company recorded a decrease of $19 million, net of tax, in AOCI and a corresponding increase in Retained earnings to correct the amount of the impact of the cumulative effect of adopting Accounting Standard Update ("ASU") 2016-01, Financial Instruments in 2018.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">These corrections are not considered material to prior period financial statements and are not expected to be material to the full year 2021 financial statements.</span></div>
CY2021Q1	luv	Total Proceeds To Be Provided To Us Airlines From Psp3 Payroll Support Per American Rescue Plan Act Of2021 TotalProceedsToBeProvidedToUSAirlinesFromPSP3PayrollSupportPerAmericanRescuePlanActOf2021	14000000000	USD
CY2021Q1	luv	Psp3 Payroll Support Program Amount Of Grant Expected To Be Allocated In Third Quarter2021 PSP3PayrollSupportProgramAmountOfGrantExpectedToBeAllocatedInThirdQuarter2021	1300000000	USD
CY2021Q1	luv	Total Employees Who Participated In Extended Emergency Time Off During2020 TotalEmployeesWhoParticipatedInExtendedEmergencyTimeOffDuring2020	11000	employees
CY2021Q4	luv	Total Employees Who Participated In Extended Emergency Time Off During2020 And2021 Who Were Still On Emergency Time Off At March312021 TotalEmployeesWhoParticipatedInExtendedEmergencyTimeOffDuring2020And2021WhoWereStillOnEmergencyTimeOffAtMarch312021	8164	employees
CY2021Q1	luv	Extended Emergency Time Off Reversal For Employees Who Accepted Through March312021 ExtendedEmergencyTimeOffReversalForEmployeesWhoAcceptedThroughMarch312021	141000000	USD
CY2021Q1	luv	Extended Emergency Time Off Accrual For Employees Who Accepted Through March312021 ExtendedEmergencyTimeOffAccrualForEmployeesWhoAcceptedThroughMarch312021	26000000	USD
CY2021Q1	luv	Proceeds From Psp2 Payroll Support Program Extension Grant Allocated To Fund Salaries Wages And Benefits ProceedsFromPSP2PayrollSupportProgramExtensionGrantAllocatedToFundSalariesWagesAndBenefits	1200000000	USD
CY2020	luv	Extended Emergency Time Off Accrual For Employees Who Accepted Through2020 ExtendedEmergencyTimeOffAccrualForEmployeesWhoAcceptedThrough2020	620000000	USD
CY2021Q1	luv	Extended Emergency Time Off Accrued Liability ExtendedEmergencyTimeOffAccruedLiability	190000000	USD
CY2021Q1	luv	Voluntary Separation Program2020 And Extended Emergency Time Off Relieved From Accrual For Employees Who Accepted Through March312021 VoluntarySeparationProgram2020AndExtendedEmergencyTimeOffRelievedFromAccrualForEmployeesWhoAcceptedThroughMarch312021	188000000	USD
CY2021Q1	luv	Voluntary Separation Program2020 And Extended Emergency Time Off Total Accrued VoluntarySeparationProgram2020AndExtendedEmergencyTimeOffTotalAccrued	611000000	USD
CY2021Q1	luv	Number Of Aircraft In Long Term Storage NumberOfAircraftInLongTermStorage	66
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	255000000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	134000000	USD
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	0	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	6000000	USD
CY2021Q1	us-gaap	Price Risk Cash Flow Hedge Unrealized Gain Loss To Be Reclassified During Next12 Months PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months	19000000	USD
CY2021Q1	luv	Interest Rate Swap Derivative Aircraft Leases Received In December2020 InterestRateSwapDerivativeAircraftLeasesReceivedInDecember2020	3	aircraft
CY2021Q1	luv	Interest Rate Swap Derivative Aircraft Leases Received In First Quarter2021 InterestRateSwapDerivativeAircraftLeasesReceivedInFirstQuarter2021	8
CY2021Q1	luv	Discontinuationof Interest Rate Cash Flow Hedge Balancein Aoci DiscontinuationofInterestRateCashFlowHedgeBalanceinAOCI	62000000	USD
CY2021Q1	luv	Maximum Sum Of Derivatives Of Counterparty To Be Included In Other MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther	4000000	USD
CY2021Q1	luv	Letterof Credit Percentof Collateral LetterofCreditPercentofCollateral	1
CY2021Q1	luv	Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts CashCollateralPercentOfFairValueFuelDerivativesContracts	1
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-94000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-13000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-9000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-47000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-28000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	64000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-125000000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	180000000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-219000000	USD
CY2021Q1	luv	Air Traffic Liability Passenger Revenueand Ancillary Passenger Services AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices	3109000000	USD
CY2020Q4	luv	Air Traffic Liability Passenger Revenueand Ancillary Passenger Services AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices	2686000000	USD
CY2021Q1	luv	Air Traffic Liability Loyalty Program AirTrafficLiabilityLoyaltyProgram	4623000000	USD
CY2020Q4	luv	Air Traffic Liability Loyalty Program AirTrafficLiabilityLoyaltyProgram	4447000000	USD
CY2021Q1	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	7732000000	USD
CY2020Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	7133000000	USD
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	4447000000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	3385000000	USD
CY2021Q1	luv	Revenue Amounts Deferred Associated With Points Awarded RevenueAmountsDeferredAssociatedWithPointsAwarded	466000000	USD
CY2020Q1	luv	Revenue Amounts Deferred Associated With Points Awarded RevenueAmountsDeferredAssociatedWithPointsAwarded	656000000	USD
CY2021Q1	luv	Passenger Revenue Recognized From Points Redeemed PassengerRevenueRecognizedFromPointsRedeemed	-278000000	USD
CY2020Q1	luv	Passenger Revenue Recognized From Points Redeemed PassengerRevenueRecognizedFromPointsRedeemed	-461000000	USD
CY2021Q1	luv	Other Revenue Recognized From Points Redeemed OtherRevenueRecognizedFromPointsRedeemed	-12000000	USD
CY2020Q1	luv	Other Revenue Recognized From Points Redeemed OtherRevenueRecognizedFromPointsRedeemed	-19000000	USD
CY2021Q1	us-gaap	Deferred Revenue DeferredRevenue	4623000000	USD
CY2020Q1	us-gaap	Deferred Revenue DeferredRevenue	3561000000	USD
CY2020Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	7133000000	USD
CY2021Q1	luv	Air Traffic Liability Current Period Sales AirTrafficLiabilityCurrentPeriodSales	2324000000	USD
CY2021Q1	luv	Air Traffic Liability Revenueamountsinbeginningbalance AirTrafficLiabilityRevenueamountsinbeginningbalance	-743000000	USD
CY2021Q1	luv	Air Traffic Liability Revenuefrom Current Period Sales AirTrafficLiabilityRevenuefromCurrentPeriodSales	-982000000	USD
CY2021Q1	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	7732000000	USD
CY2019Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5510000000	USD
CY2020Q1	luv	Air Traffic Liability Current Period Sales AirTrafficLiabilityCurrentPeriodSales	4565000000	USD
CY2020Q1	luv	Air Traffic Liability Revenueamountsinbeginningbalance AirTrafficLiabilityRevenueamountsinbeginningbalance	-1949000000	USD
CY2020Q1	luv	Air Traffic Liability Revenuefrom Current Period Sales AirTrafficLiabilityRevenuefromCurrentPeriodSales	-1915000000	USD
CY2020Q1	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	6211000000	USD
CY2021Q1	luv	Residual Travel Funds ResidualTravelFunds	0.22
CY2020Q4	luv	Residual Travel Funds ResidualTravelFunds	0.28
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-94000000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	591000000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	515000000	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	16000000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	1000000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	609000000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	515000000	shares
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.18
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
CY2021Q1	us-gaap	Debt Instrument Convertible Conversion Price1 DebtInstrumentConvertibleConversionPrice1	38.48
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CY2021Q1	us-gaap	Debt Instrument Convertible Remaining Discount Amortization Period1 DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1	P5Y
CY2021Q1	luv	Trade Receivables TradeReceivables	59000000	USD
CY2020Q4	luv	Trade Receivables TradeReceivables	46000000	USD
CY2021Q1	us-gaap	Credit Card Receivables CreditCardReceivables	92000000	USD
CY2020Q4	us-gaap	Credit Card Receivables CreditCardReceivables	35000000	USD
CY2021Q1	luv	Business Partners And Other Suppliers BusinessPartnersAndOtherSuppliers	73000000	USD
CY2020Q4	luv	Business Partners And Other Suppliers BusinessPartnersAndOtherSuppliers	274000000	USD
CY2021Q1	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	705000000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	740000000	USD
CY2021Q1	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	8000000	USD
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	35000000	USD
CY2021Q1	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	937000000	USD
CY2020Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	1130000000	USD
CY2021Q1	luv	Derivative Asset Fair Value Amount Offset Against Collateral Total DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal	131000000	USD
CY2020Q4	luv	Derivative Asset Fair Value Amount Offset Against Collateral Total DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal	90000000	USD
CY2021Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	295000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	295000000	USD
CY2021Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	317000000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	337000000	USD
CY2021Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	743000000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	722000000	USD
CY2021Q1	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	169000000	USD
CY2020Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	111000000	USD
CY2021Q1	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	197000000	USD
CY2020Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	201000000	USD
CY2021Q1	us-gaap	Taxes Payable Current TaxesPayableCurrent	190000000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	49000000	USD
CY2021Q1	luv	Aircraft Maintenance Payable AircraftMaintenancePayable	83000000	USD
CY2020Q4	luv	Aircraft Maintenance Payable AircraftMaintenancePayable	95000000	USD
CY2021Q1	luv	Fuel Payable FuelPayable	98000000	USD
CY2020Q4	luv	Fuel Payable FuelPayable	66000000	USD
CY2021Q1	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	357000000	USD
CY2020Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	409000000	USD
CY2021Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	1094000000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	931000000	USD
CY2021Q1	luv	Extended Emergency Time Off Accrued Liability ExtendedEmergencyTimeOffAccruedLiability	190000000	USD
CY2020Q4	luv	Extended Emergency Time Off Accrued Liability ExtendedEmergencyTimeOffAccruedLiability	393000000	USD
CY2021Q1	luv	Voluntary Separation Program2020 Accrued Liability VoluntarySeparationProgram2020AccruedLiability	124000000	USD
CY2020Q4	luv	Voluntary Separation Program2020 Accrued Liability VoluntarySeparationProgram2020AccruedLiability	143000000	USD
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CY2020Q4	us-gaap	Deferred Compensation Cash Based Arrangements Liability Current DeferredCompensationCashBasedArrangementsLiabilityCurrent	25000000	USD
CY2021Q1	luv	Vendor Prepayment VendorPrepayment	277000000	USD
CY2020Q4	luv	Vendor Prepayment VendorPrepayment	600000000	USD
CY2021Q1	us-gaap	Accrued Vacation Current AccruedVacationCurrent	443000000	USD
CY2020Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	436000000	USD
CY2021Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	109000000	USD
CY2020Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	111000000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	163000000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	161000000	USD
CY2021Q1	luv	Accrualfor Propertyand Income Taxes AccrualforPropertyandIncomeTaxes	80000000	USD
CY2020Q4	luv	Accrualfor Propertyand Income Taxes AccrualforPropertyandIncomeTaxes	84000000	USD
CY2021Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	122000000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	257000000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1665000000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	2259000000	USD
CY2021Q1	luv	Extended Emergency Time Off Other Noncurrent Liability ExtendedEmergencyTimeOffOtherNoncurrentLiability	0	USD
CY2021Q1	luv	Assets Constructed For Others AssetsConstructedForOthers	341000000	USD
CY2020Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	309000000	USD
CY2020Q4	luv	Extended Emergency Time Off Other Noncurrent Liability ExtendedEmergencyTimeOffOtherNoncurrentLiability	57000000	USD
CY2021Q1	luv	Voluntary Separation Program2020 Other Noncurrent Liability VoluntarySeparationProgram2020OtherNoncurrentLiability	297000000	USD
CY2020Q4	luv	Voluntary Separation Program2020 Other Noncurrent Liability VoluntarySeparationProgram2020OtherNoncurrentLiability	321000000	USD
CY2021Q1	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	430000000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	428000000	USD
CY2021Q1	us-gaap	Other Deferred Compensation Arrangements Liability Classified Noncurrent OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent	319000000	USD
CY2020Q4	us-gaap	Other Deferred Compensation Arrangements Liability Classified Noncurrent OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent	353000000	USD
CY2021Q1	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	77000000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	88000000	USD
CY2021Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1123000000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1247000000	USD
CY2020Q4	luv	Vendor Prepayment VendorPrepayment	600000000	USD
CY2021Q1	luv	Deferred Revenue Related To Vendor Prepayment DeferredRevenueRelatedToVendorPrepayment	323000000	USD
CY2021Q1	luv	Amount Of Deferred Revenue From Vendor Prepayment That Would Have Been Receivable At Period End AmountOfDeferredRevenueFromVendorPrepaymentThatWouldHaveBeenReceivableAtPeriodEnd	106000000	USD
CY2021Q1	luv	Cash Tax Refund Expected From Cares Act Loss Carry Back Provision CashTaxRefundExpectedFromCARESActLossCarryBackProvision	470000000	USD
CY2021Q1	luv	Cares Act Loss Carryback Period CARESActLossCarrybackPeriod	P5Y
CY2021Q1	luv	Total Number Of Boeing737 Max7 Firm Orders Added To Purchase Agreement Per Supplemental Agreement No12 TotalNumberOfBoeing737MAX7FirmOrdersAddedToPurchaseAgreementPerSupplementalAgreementNo12	100	aircraft
CY2021Q1	luv	Number Of Boeing737 Max7 Firm Orders Added To Purchase Agreement Per Supplemental Agreement No12 To Be Delivered In2022 NumberOfBoeing737MAX7FirmOrdersAddedToPurchaseAgreementPerSupplementalAgreementNo12ToBeDeliveredIn2022	30	aircraft
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	1000000000.0	USD
CY2021Q1	luv	Total Number Of Boeing737 Max Options Added To Purchase Agreement Per Supplemental Agreement No12 TotalNumberOfBoeing737MAXOptionsAddedToPurchaseAgreementPerSupplementalAgreementNo12	155	aircraft
CY2021Q1	luv	Total Number Of Boeing737 Max8 Firm Orders Converted To737 Max7 Firm Orders Per Supplemental Agreement No12 TotalNumberOfBoeing737MAX8FirmOrdersConvertedTo737MAX7FirmOrdersPerSupplementalAgreementNo12	70	aircraft
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Due In Remainder Of Fiscal Year UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear	0	USD
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	700000000	USD
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	1100000000	USD
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	1100000000	USD
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1200000000	USD
CY2021Q1	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	7200000000	USD
CY2021Q1	luv	Numberof Aircraft Grounded Under Emergency Order NumberofAircraftGroundedUnderEmergencyOrder	34
CY2021Q1	luv	After Tax Potential Concessionsand Other Considerations Announced July2019 AfterTaxPotentialConcessionsandOtherConsiderationsAnnouncedJuly2019	4900000000	USD
CY2021Q1	luv	Pre Tax Potential Concessionsand Other Considerations Announced January2020 PreTaxPotentialConcessionsandOtherConsiderationsAnnouncedJanuary2020	2600000000	USD
CY2021Q1	luv	Numberof Aircraft Grounded Under Emergency Order NumberofAircraftGroundedUnderEmergencyOrder	34
CY2021Q1	luv	Numberof Aircraft Not Delivered Dueto Grounding Under Emergency Order NumberofAircraftNotDeliveredDuetoGroundingUnderEmergencyOrder	41	aircraft
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	312000000	USD
CY2021Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	95000000	USD
CY2021Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	599000000	USD

Files In Submission

Name	View Source	Status
0000092380-21-000101-index-headers.html	Edgar Link	pending
0000092380-21-000101-index.html	Edgar Link	pending
0000092380-21-000101.txt	Edgar Link	pending
0000092380-21-000101-xbrl.zip	Edgar Link	pending
exhibit101sa-12topax3729re.htm	Edgar Link	pending
exhibit102boeingcertaincon.htm	Edgar Link	pending
exhibit103tomortgageandsec.htm	Edgar Link	pending
exhibit104payrollsupportpr.htm	Edgar Link	pending
exhibit105psp3-warrantagre.htm	Edgar Link	pending
exhibit106psp3-promissoryn.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image_015.jpg	Edgar Link	pending
image_016.jpg	Edgar Link	pending
image_1216.jpg	Edgar Link	pending
luv-20210331.htm	Edgar Link	pending
luv-20210331.xsd	Edgar Link	pending
luv-20210331_cal.xml	Edgar Link	unprocessable
luv-20210331_def.xml	Edgar Link	unprocessable
luv-20210331_g1.jpg	Edgar Link	pending
luv-20210331_htm.xml	Edgar Link	completed
luv-20210331_lab.xml	Edgar Link	unprocessable
luv-20210331_pre.xml	Edgar Link	unprocessable
luv-3312021xex311.htm	Edgar Link	pending
luv-3312021xex312.htm	Edgar Link	pending
luv-3312021xex321.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$LUV
SOUTHWEST AIRLINES CO Stock $luv

2021 Q1 Form 10-Q Financial Statement

#000009238021000101 Filed on April 27, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV SOUTHWEST AIRLINES CO Stock $luv

2021 Q1 Form 10-Q Financial Statement

#000009238021000101 Filed on April 27, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV
SOUTHWEST AIRLINES CO Stock $luv