$LUV
SOUTHWEST AIRLINES CO Stock $luv

$luv Overview Financials Valuation SEC Filings Company Website

2019 Form 10-K Financial Statement

#000009238020000024 Filed on February 04, 2020

Income Statement

Concept	2019	2018 Q4	2018 Q3
Revenue	$22.43B	$5.704B	$5.575B
YoY Change	2.11%	8.48%	5.13%
Cost Of Revenue	$5.710B	$1.554B	$1.583B
YoY Change	-6.56%	12.36%	12.11%
Gross Profit	$16.72B	$4.150B	$3.992B
YoY Change	5.45%	7.1%	2.6%
Gross Profit Margin	74.54%	72.76%	71.61%
Selling, General & Admin	$9.914B	$2.283B	$2.195B
YoY Change	13.23%	5.55%	6.86%
% of Gross Profit	59.3%	55.01%	54.98%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.219B	$331.0M	$301.0M
YoY Change	1.5%	18.64%	-0.33%
% of Gross Profit	7.29%	7.98%	7.54%
Operating Expenses	$19.47B	$3.330B	$4.777B
YoY Change	3.8%	6.22%	7.16%
Operating Profit	$2.957B	$820.0M	$798.0M
YoY Change	-7.77%	10.66%	-5.56%
Interest Expense	$118.0M	-$1.000M	$33.00M
YoY Change	-9.92%	-80.0%	17.86%
% of Operating Profit	3.99%	-0.12%	4.14%
Other Income/Expense, Net	$0.00	-$2.000M	-$12.00M
YoY Change	-100.0%		-7.69%
Pretax Income	$2.957B	$817.0M	$786.0M
YoY Change	-6.54%	11.01%	-5.53%
Income Tax	$657.0M	$163.0M	$171.0M
% Of Pretax Income	22.22%	19.95%	21.76%
Net Earnings	$2.300B	$654.0M	$615.0M
YoY Change	-6.69%	-62.56%	16.48%
Net Earnings / Revenue	10.26%	11.47%	11.03%
Basic Earnings Per Share	$4.28	$1.17	$1.08
Diluted Earnings Per Share	$4.27	$1.17	$1.08
COMMON SHARES
Basic Shares Outstanding	538.0M shares	562.3M shares	569.0M shares
Diluted Shares Outstanding	539.0M shares		569.0M shares

Balance Sheet

Concept	2019	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.072B	$3.689B	$3.820B
YoY Change	10.38%	12.71%	25.66%
Cash & Equivalents	$2.548B	$1.854B	$2.104B
Short-Term Investments	$1.524B	$1.835B	$1.716B
Other Short-Term Assets	$287.0M	$310.0M	$514.0M
YoY Change	-7.42%	-32.61%	130.49%
Inventory	$529.0M	$461.0M	$483.0M
Prepaid Expenses
Receivables	$1.086B	$568.0M	$784.0M
Other Receivables	$0.00	$63.00M	$0.00
Total Short-Term Assets	$5.974B	$5.028B	$5.601B
YoY Change	18.81%	4.42%	30.86%
LONG-TERM ASSETS
Property, Plant & Equipment	$18.37B	$19.53B	$19.28B
YoY Change	-5.9%	5.32%	6.19%
Goodwill		$970.0M	$970.0M
YoY Change		0.0%	0.0%
Intangibles		$400.0M	$403.0M
YoY Change		-3.15%	-3.13%
Long-Term Investments
YoY Change
Other Assets	$281.0M	$720.0M	$1.032B
YoY Change	8.49%	-8.4%	22.42%
Total Long-Term Assets	$19.92B	$21.22B	$21.28B
YoY Change	-6.1%	4.53%	6.57%
TOTAL ASSETS
Total Short-Term Assets	$5.974B	$5.028B	$5.601B
Total Long-Term Assets	$19.92B	$21.22B	$21.28B
Total Assets	$25.90B	$26.24B	$26.88B
YoY Change	-1.33%	4.51%	10.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$595.0M	$1.416B	$1.224B
YoY Change	31.06%	7.27%	8.9%
Accrued Expenses	$2.333B	$1.749B	$1.517B
YoY Change	18.73%	2.88%	-4.77%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$819.0M	$606.0M	$346.0M
YoY Change	35.15%	74.14%	9.49%
Total Short-Term Liabilities	$8.952B	$7.905B	$7.843B
YoY Change	13.24%	15.18%	12.61%
LONG-TERM LIABILITIES
Long-Term Debt	$1.846B	$2.819B	$3.156B
YoY Change	-34.52%	-17.21%	10.47%
Other Long-Term Liabilities	$2.901B	$650.0M	$748.0M
YoY Change	-10.44%	-8.06%	4.91%
Total Long-Term Liabilities	$4.747B	$650.0M	$748.0M
YoY Change	-21.64%	-8.06%	4.91%
TOTAL LIABILITIES
Total Short-Term Liabilities	$8.952B	$7.905B	$7.843B
Total Long-Term Liabilities	$4.747B	$650.0M	$748.0M
Total Liabilities	$16.06B	$8.555B	$8.591B
YoY Change	-2.0%	13.01%	11.89%
SHAREHOLDERS EQUITY
Retained Earnings		$15.97B	$15.40B
YoY Change		15.44%	20.27%
Common Stock		$2.318B	$2.293B
YoY Change		2.61%	2.18%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$8.452B	$7.954B
YoY Change		30.8%	30.09%
Treasury Stock Shares		255.0M shares
Shareholders Equity	$9.832B	$9.853B	$10.15B
YoY Change
Total Liabilities & Shareholders Equity	$25.90B	$26.24B	$26.88B
YoY Change	-1.33%	4.51%	10.86%

Cashflow Statement

Concept	2019	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$2.300B	$654.0M	$615.0M
YoY Change	-6.69%	-62.56%	16.48%
Depreciation, Depletion And Amortization	$1.219B	$331.0M	$301.0M
YoY Change	1.5%	18.64%	-0.33%
Cash From Operating Activities	$3.987B	$989.0M	$1.271B
YoY Change	-18.52%	75.67%	27.61%
INVESTING ACTIVITIES
Capital Expenditures	-$1.027B	-$543.0M	-$463.0M
YoY Change	-48.03%	1.88%	-29.2%
Acquisitions
YoY Change
Other Investing Activities	$0.00	-$125.0M	-$5.000M
YoY Change	-100.0%	-38.12%
Cash From Investing Activities	-$303.0M	-$668.0M	-$604.0M
YoY Change	-85.13%	-9.12%	-2.58%
FINANCING ACTIVITIES
Cash Dividend Paid	$372.0M		$91.00M
YoY Change	12.05%		21.33%
Common Stock Issuance & Retirement, Net	$2.000B		$500.0M
YoY Change	0.0%		66.67%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$2.990B	-571.0M	-$677.0M
YoY Change	19.79%	-375.85%	49.45%
NET CHANGE
Cash From Operating Activities	$3.987B	989.0M	$1.271B
Cash From Investing Activities	-$303.0M	-668.0M	-$604.0M
Cash From Financing Activities	-$2.990B	-571.0M	-$677.0M
Net Change In Cash	$694.0M	-250.0M	-$10.00M
YoY Change	93.31%	-814.29%	-87.01%
FREE CASH FLOW
Cash From Operating Activities	$3.987B	$989.0M	$1.271B
Capital Expenditures	-$1.027B	-$543.0M	-$463.0M
Free Cash Flow	$5.014B	$1.532B	$1.734B
YoY Change	-27.01%	39.78%	5.09%

Facts In Submission

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CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000092380
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CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.605
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.700
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CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
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CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	807611634	shares
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2000000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	8000000	USD
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CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	288547318	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-7259
CY2019	dei	Entity Registrant Name EntityRegistrantName	SOUTHWEST AIRLINES CO.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	TX
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	74-1563240
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	P.O. Box 36611
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Dallas,
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75235-1611
CY2019	dei	City Area Code CityAreaCode	214
CY2019	dei	Local Phone Number LocalPhoneNumber	792-4000
CY2019	dei	Security12g Title Security12gTitle	None
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
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CY2019	dei	Entity Shell Company EntityShellCompany	false
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CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.57
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2300000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2465000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3357000000	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	-52000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	26000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-6000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-81000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	335000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2219000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2491000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3692000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	7784000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1600000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	14000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	37000000	USD
CY2017	us-gaap	Dividends Cash DividendsCash	286000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3692000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	9641000000	USD
CY2017Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	0	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2000000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	23000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	46000000	USD
CY2018	us-gaap	Dividends Cash DividendsCash	348000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2491000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	9853000000	USD
CY2018Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	55000000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2000000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	27000000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	55000000	USD
CY2019	us-gaap	Dividends Cash DividendsCash	377000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2219000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	9832000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2300000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2465000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3357000000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1219000000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1201000000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1218000000	USD
CY2019	luv	Aircraftgroundingcharge Aircraftgroundingcharge	0	USD
CY2018	luv	Aircraftgroundingcharge Aircraftgroundingcharge	0	USD
CY2017	luv	Aircraftgroundingcharge Aircraftgroundingcharge	63000000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	14000000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	50000000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	55000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-301000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1066000000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	94000000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-117000000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	102000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-239000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	227000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	262000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	298000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	545000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	233000000	USD
CY2019	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	440000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	506000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	343000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-277000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	0	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	0	USD
CY2019	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	25000000	USD
CY2018	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	-15000000	USD
CY2017	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	316000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-108000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	14000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-121000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3987000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4893000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3929000000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1027000000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1922000000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2123000000	USD
CY2019	luv	Supplier Proceeds SupplierProceeds	-400000000	USD
CY2018	luv	Supplier Proceeds SupplierProceeds	0	USD
CY2017	luv	Supplier Proceeds SupplierProceeds	0	USD
CY2019	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	0	USD
CY2018	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	54000000	USD
CY2017	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	126000000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	2122000000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	2409000000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	2380000000	USD
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2446000000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2342000000	USD
CY2017	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2221000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-5000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-303000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2038000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2408000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	600000000	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	40000000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	35000000	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	29000000	USD
CY2019	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	0	USD
CY2018	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	170000000	USD
CY2017	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	126000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	615000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	342000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	592000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	372000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	332000000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	274000000	USD
CY2019	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	0	USD
CY2018	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	30000000	USD
CY2017	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	10000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2000000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2000000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1600000000	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	3000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	15000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2990000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2496000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1706000000	USD
CY2019	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	694000000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	359000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-185000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1854000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1495000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1680000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2548000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1854000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1495000000	USD
CY2019Q4	luv	Intangible Assets Gross IntangibleAssetsGross	309000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	13000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	88000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	107000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	81000000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	779000000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	327000000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	992000000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	1000000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	32000000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	233000000	USD
CY2019	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	65000000	USD
CY2018	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	171000000	USD
CY2017	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	197000000	USD
CY2019	luv	Supplier Receivables SupplierReceivables	428000000	USD
CY2018	luv	Supplier Receivables SupplierReceivables	0	USD
CY2017	luv	Supplier Receivables SupplierReceivables	0	USD
CY2017	luv	Aircraftgroundedduring September2017 AircraftgroundedduringSeptember2017	61	aircraft
CY2017	luv	Changein Accounting Estimate Financial Effecton Depreciation Expense Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonDepreciationExpenseDepreciationEstimate	21000000	USD
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Depreciation Adjustment ChangeinAccountingEstimateFinancialEffectonNetIncomeDepreciationAdjustment	-19000000	USD
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDepreciationEstimate	-0.03
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Diluted Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDilutedDepreciationEstimate	-0.03
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P12Y
CY2018Q4	luv	Intangible Assets Gross IntangibleAssetsGross	502000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	103000000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	15000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	16000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	212000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	215000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	224000000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	630000000	USD
CY2018Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	674000000	USD
CY2019	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	177000000	USD
CY2018	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	155000000	USD
CY2017	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	168000000	USD
CY2019	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;text-indent:16px;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;font-style:italic;font-weight:bold;">Concentration Risk</span></div><div style="line-height:120%;text-indent:16px;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">Approximately </span><span style="font-family:inherit;font-size:11pt;"><span>83 percent</span></span><span style="font-family:inherit;font-size:11pt;"> of the Company’s full-time equivalent Employees are unionized and are covered by collective-bargaining agreements. A percentage of the Company's unionized Employees, including its Flight Attendants, Customer Service Agents, Dispatchers, Flight Crew Training Instructors, and Meteorologists, which had contracts that became amendable on or before December 31, 2019, are in discussions on labor agreements. Those unionized Employee groups in discussions represent approximately </span><span style="font-family:inherit;font-size:11pt;"><span>40 percent</span></span><span style="font-family:inherit;font-size:11pt;"> of the Company’s full-time equivalent Employees as of </span><span style="font-family:inherit;font-size:11pt;">December 31, 2019</span><span style="font-family:inherit;font-size:11pt;">. </span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Company attempts to minimize its concentration risk with regards to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security or money market fund.</span></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">To manage risk associated with financial derivative instruments held, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty, and monitors the market position of the program and its relative market position with each counterparty. The Company also has agreements with </span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount or credit ratings fall below certain levels. Collateral deposits provided to or held from counterparties serve to decrease, but not totally eliminate, the credit risk associated with the Company’s hedging program. See </span><span style="font-family:inherit;font-size:11pt;">Note 10</span><span style="font-family:inherit;font-size:11pt;"> for further information.</span></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">As of </span><span style="font-family:inherit;font-size:11pt;">December 31, 2019</span><span style="font-family:inherit;font-size:11pt;">, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. The Boeing 737 MAX aircraft ("MAX") are crucial to the Company’s growth plans and fleet modernization initiatives. On March 13, 2019, the FAA issued an emergency order for all U.S. airlines to ground the MAX aircraft, including the </span><span style="font-family:inherit;font-size:11pt;"><span>34</span></span><span style="font-family:inherit;font-size:11pt;"> MAX aircraft in the Company’s fleet. The MAX aircraft remains grounded and, based on continued uncertainty around the timing of the MAX return to service, the Company has removed the MAX from its flight schedule through June 6, 2020. Based on recent guidance from Boeing estimating that the ungrounding of the MAX will be mid-2020, the Company will likely extend MAX-related flight schedule adjustments further to provide operational reliability and dependable flight schedules for our Customers booking their summer travel. Further, MAX deliveries have remained suspended following the MAX groundings and Boeing is not currently manufacturing new MAX aircraft. The Company does not know whether, on what conditions, or when the MAX groundings will end. Regulatory approval of MAX return to service is subject to Boeing's ongoing work with the FAA, who will determine the timing of MAX return to service.</span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The MAX groundings adversely affected operating results for the year ended December 31, 2019, and could have a material, adverse effect on the Company's operating results in future periods. A continued prolonged extension or permanent grounding of the MAX aircraft would require additional flight schedule adjustments and result in further delays in aircraft deliveries, as well as lower operating revenues, operating income, and net income due to a variety of factors, including, among others, (i) lost revenue due to flight cancellations and disruptions as a result of a smaller operating aircraft fleet, (ii) the lack of ability to make corresponding reductions in expenses because of the fixed nature of many expenses, and (iii) possible negative effects on Customer confidence and airline choice. </span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">Boeing no longer manufactures versions of the 737 other than the 737 MAX family of aircraft. If the 737 MAX aircraft were to remain unavailable for the Company’s flight operations, the Company’s growth would be restricted unless and until it could procure and operate other types of aircraft from Boeing or another manufacturer, seller, or lessor, and the Company’s operations would be materially adversely affected. In particular, if the Company’s growth were to be dependent upon the introduction of a new aircraft make and model to the Company’s fleet, the Company would need to, among other things, (i) develop and implement new maintenance, operating, and training programs, (ii) secure extensive regulatory approvals, and (iii) implement new technologies. The requirements associated with operating a new aircraft make and model could take an extended period of time to fulfill and would likely impose substantial costs on the Company. A shift away from a single fleet type could also add complexity to the Company’s operations, present operational and compliance risks, and materially increase the Company's costs. Any of these events would have a material, adverse effect on the Company's business, operating results, and financial condition. The Company could also be materially adversely affected if the pricing or operational attributes of its aircraft were to become less competitive. See Note 16 for further information. </span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Company is also dependent on sole or limited suppliers for aircraft engines and certain other aircraft parts and services and would, therefore, also be materially adversely impacted in the event of the unavailability of, inadequate support for, or a mechanical or regulatory issue associated with, engines and other parts.</span></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Company has historically entered into agreements with some of its co-brand, payment, and loyalty partners that contain exclusivity aspects which place certain confidential restrictions on the Company from entering into certain arrangements with other payment and loyalty partners. These arrangements generally extend for the terms of the agreements, which typically are for five to seven years, but none of which are more than ten years in length. Some of these agreements automatically renew on an annual basis, unless either party objects to such extension. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.</span></div>
CY2019Q4	luv	Percentage Of Employees Represented By Unions Under Collective Bargaining Agreements PercentageOfEmployeesRepresentedByUnionsUnderCollectiveBargainingAgreements	0.40
CY2019Q4	luv	Numberof Aircraft Grounded Under Emergency Order NumberofAircraftGroundedUnderEmergencyOrder	34
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2300000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2465000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3357000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	538000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	573000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	601000000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	539000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	574000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	603000000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.28
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.30
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.58
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.27
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.29
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.57
CY2019Q4	luv	Numberof Aircraft Grounded Under Emergency Order NumberofAircraftGroundedUnderEmergencyOrder	34
CY2019Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	164000000	USD
CY2019Q4	luv	Assets Constructed For Others Net AssetsConstructedForOthersNet	164000000	USD
CY2019Q4	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	164000000	USD
CY2018Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	1768000000	USD
CY2018Q4	luv	Assets Constructed For Others Net AssetsConstructedForOthersNet	1637000000	USD
CY2018Q4	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	1701000000	USD
CY2019Q4	luv	Air Traffic Liability Passenger Revenueand Ancillary Passenger Services AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices	2125000000	USD
CY2018Q4	luv	Air Traffic Liability Passenger Revenueand Ancillary Passenger Services AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices	2059000000	USD
CY2019Q4	luv	Air Traffic Liability Loyalty Program AirTrafficLiabilityLoyaltyProgram	3385000000	USD
CY2018Q4	luv	Air Traffic Liability Loyalty Program AirTrafficLiabilityLoyaltyProgram	3011000000	USD
CY2019Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5510000000	USD
CY2018Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5070000000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	3011000000	USD
CY2017Q4	us-gaap	Deferred Revenue DeferredRevenue	2667000000	USD
CY2019	luv	Revenue Amounts Deferred Associated With Points Awarded RevenueAmountsDeferredAssociatedWithPointsAwarded	2941000000	USD
CY2018	luv	Revenue Amounts Deferred Associated With Points Awarded RevenueAmountsDeferredAssociatedWithPointsAwarded	2717000000	USD
CY2019	luv	Passenger Revenue Recognized From Points Redeemed PassengerRevenueRecognizedFromPointsRedeemed	-2487000000	USD
CY2018	luv	Passenger Revenue Recognized From Points Redeemed PassengerRevenueRecognizedFromPointsRedeemed	-2307000000	USD
CY2019	luv	Other Revenue Recognized From Points Redeemed OtherRevenueRecognizedFromPointsRedeemed	-80000000	USD
CY2018	luv	Other Revenue Recognized From Points Redeemed OtherRevenueRecognizedFromPointsRedeemed	-66000000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	3385000000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	3011000000	USD
CY2018Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5070000000	USD
CY2019	luv	Air Traffic Liability Current Period Sales AirTrafficLiabilityCurrentPeriodSales	21296000000	USD
CY2019	luv	Air Traffic Liability Revenueamountsinbeginningbalance AirTrafficLiabilityRevenueamountsinbeginningbalance	-3816000000	USD
CY2019	luv	Air Traffic Liability Revenuefrom Current Period Sales AirTrafficLiabilityRevenuefromCurrentPeriodSales	-17040000000	USD
CY2019Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5510000000	USD
CY2017Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	4565000000	USD
CY2018	luv	Air Traffic Liability Current Period Sales AirTrafficLiabilityCurrentPeriodSales	21026000000	USD
CY2018	luv	Air Traffic Liability Revenueamountsinbeginningbalance AirTrafficLiabilityRevenueamountsinbeginningbalance	-3479000000	USD
CY2018	luv	Air Traffic Liability Revenuefrom Current Period Sales AirTrafficLiabilityRevenuefromCurrentPeriodSales	-17042000000	USD
CY2018Q4	luv	Air Traffic Liability Total AirTrafficLiabilityTotal	5070000000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	627000000	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	845000000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	2678000000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3396000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	819000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	606000000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	13000000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	19000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1846000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2771000000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	148000000	USD
CY2019	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	1.000
CY2019Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	990000000	USD
CY2019Q4	luv	Net Book Value Of Additional Assets Pledged As Collateral In Case Obligations Related To Fuel Derivatives Exceed Certain Thresholds NetBookValueOfAdditionalAssetsPledgedAsCollateralInCaseObligationsRelatedToFuelDerivativesExceedCertainThresholds	1200000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Repayments Of Principal In Next Twelve Months LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths	819000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Two LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo	170000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Three LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree	475000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Four LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour	103000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive	103000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal After Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive	990000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	78000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	41000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	17000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	7000000	USD
CY2019Q4	luv	Operating Leases Future Minimum Payments Duein Six Years OperatingLeasesFutureMinimumPaymentsDueinSixYears	1000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1349000000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	779000000	USD
CY2019Q4	luv	Lease Rightof Use Asset LeaseRightofUseAsset	2128000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	353000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	85000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	978000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	542000000	USD
CY2019Q4	luv	Lease Liability LeaseLiability	1958000000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4000000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	1377000000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	116000000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	26000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	142000000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	97000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	379000000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	26000000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	85000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	230000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1000000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.037
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.038
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	543000000	USD
CY2019Q4	luv	Lessee Operating Lease Lease Notyet Commenced LesseeOperatingLeaseLeaseNotyetCommenced	16	aircraft
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Number Of Units PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits	51	Years
CY2018Q4	us-gaap	Capital Leased Assets Number Of Units CapitalLeasedAssetsNumberOfUnits	72	aircraft
CY2018Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	1300000000	USD
CY2018Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	304000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	935000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	939000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	111000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	348000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	92000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net Current OperatingLeasesFutureMinimumPaymentsNetCurrent	256000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	109000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	357000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	78000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net In Two Years OperatingLeasesFutureMinimumPaymentsNetInTwoYears	279000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	105000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	244000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	41000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net In Three Years OperatingLeasesFutureMinimumPaymentsNetInThreeYears	203000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	100000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	172000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	17000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net In Four Years OperatingLeasesFutureMinimumPaymentsNetInFourYears	155000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	97000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	146000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	7000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net In Five Years OperatingLeasesFutureMinimumPaymentsNetInFiveYears	139000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	335000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	474000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	1000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net Thereafter OperatingLeasesFutureMinimumPaymentsNetThereafter	473000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	857000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1741000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	236000000	USD
CY2018Q4	luv	Operating Leases Future Minimum Payments Net OperatingLeasesFutureMinimumPaymentsNet	1505000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	126000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	731000000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	85000000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	646000000	USD
CY2018Q4	us-gaap	Lease Incentive Receivable LeaseIncentiveReceivable	114000000	USD
CY2017Q3	luv	A737300 Aircraftgroundingcharge A737300Aircraftgroundingcharge	63000000	USD
CY2019Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	60000000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	27000000	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	55000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	46000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	37000000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	64000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M18D
CY2019Q4	luv	Stock Available For Issue Number Employee Stock Purchase Plan StockAvailableForIssueNumberEmployeeStockPurchasePlan	7000000	shares
CY2019	luv	Percentage Of Market Value For Shares Available Under Employee Stock Purchase Plan PercentageOfMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	0.90
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	544000	shares
CY2017Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	50.13
CY2017	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	5.57	USD
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	661000	shares
CY2018Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	50.73
CY2018	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	5.64	USD
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	821000	shares
CY2019Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	47.60
CY2019	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	5.29	USD
CY2019	luv	Discount Percentage Off Market Value For Shares Available Under Employee Stock Purchase Plan DiscountPercentageOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	0.10
CY2019	luv	Percentageofactualconsumptionhedged Percentageofactualconsumptionhedged	0.73
CY2019Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge	19000000	USD
CY2018Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge	20000000	USD
CY2019	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	95000000	USD
CY2018	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	135000000	USD
CY2017	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	136000000	USD
CY2019Q4	us-gaap	Price Risk Cash Flow Hedge Unrealized Gain Loss To Be Reclassified During Next12 Months PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months	-36000000	USD
CY2019Q4	luv	Maximum Sum Of Derivatives Of Counterparty To Be Included In Other MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther	7000000	USD
CY2019Q4	luv	Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts CashCollateralPercentOfFairValueFuelDerivativesContracts	1
CY2019Q4	luv	Letterof Credit Percentof Collateral LetterofCreditPercentofCollateral	1
CY2019Q4	us-gaap	Time Deposits TimeDeposits	60000000	USD
CY2019	luv	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Gain Loss Includedin Other Comprehensive Income Loss Total FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisGainLossIncludedinOtherComprehensiveIncomeLossTotal	-112000000	USD
CY2018	luv	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Gain Loss Includedin Other Comprehensive Income Loss Total FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisGainLossIncludedinOtherComprehensiveIncomeLossTotal	-1000000	USD
CY2019	luv	Debt Instrument Agreements Not Publicly Held DebtInstrumentAgreementsNotPubliclyHeld	3	Agreements
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1200000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1000000000.0	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1000000000.0	USD
CY2019	luv	Defined Contribution Pension Plans Maximum Age Requirement For Paying Medical And Dental Premiums With Accrued Unused Sick Time DefinedContributionPensionPlansMaximumAgeRequirementForPayingMedicalAndDentalPremiumsWithAccruedUnusedSickTime	P65Y
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	232000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	275000000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	17000000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	18000000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	10000000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	9000000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	9000000	USD
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5000000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-38000000	USD
CY2018	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	69000000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2018	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	-4000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	288000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	232000000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-38000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	9000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	10000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	12000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	13000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	15000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	107000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-288000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-232000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	24000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	64000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	4000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	5000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	20000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	59000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-288000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-232000000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	17000000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	18000000	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	18000000	USD
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$LUV
SOUTHWEST AIRLINES CO Stock $luv

2019 Form 10-K Financial Statement

#000009238020000024 Filed on February 04, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV SOUTHWEST AIRLINES CO Stock $luv

2019 Form 10-K Financial Statement

#000009238020000024 Filed on February 04, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV
SOUTHWEST AIRLINES CO Stock $luv