$LUV
SOUTHWEST AIRLINES CO Stock $luv

$luv Overview Financials Valuation SEC Filings Company Website

2017 Form 10-K Financial Statement

#000009238018000031 Filed on February 07, 2018

Income Statement

Concept	2017	2016 Q4	2016 Q3
Revenue	$21.17B	$5.076B	$5.139B
YoY Change	3.65%	1.99%	-3.37%
Cost Of Revenue	$5.368B	$1.299B	$1.304B
YoY Change	7.1%	14.35%	0.38%
Gross Profit	$15.78B	$3.776B	$3.835B
YoY Change	3.28%	-1.69%	-4.58%
Gross Profit Margin	74.53%	74.39%	74.63%
Selling, General & Admin	$8.306B	$1.953B	$2.167B
YoY Change	6.07%	0.98%	10.67%
% of Gross Profit	52.64%	51.72%	56.51%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.218B	$318.0M	$315.0M
YoY Change	-0.25%	20.45%	22.57%
% of Gross Profit	7.72%	8.42%	8.21%
Operating Expenses	$17.74B	$2.931B	$4.444B
YoY Change	5.8%	4.38%	8.58%
Operating Profit	$3.407B	$846.0M	$695.0M
YoY Change	-3.27%	-17.54%	-43.27%
Interest Expense	$114.0M	-$36.00M	$31.00M
YoY Change	-6.56%	-79.89%	0.0%
% of Operating Profit	3.35%	-4.26%	4.46%
Other Income/Expense, Net	-$142.0M		-$77.00M
YoY Change	97.22%		-73.63%
Pretax Income	$3.265B	$809.0M	$618.0M
YoY Change	-5.36%	-4.49%	-33.76%
Income Tax	-$92.00M	$287.0M	$230.0M
% Of Pretax Income	-2.82%	35.48%	37.22%
Net Earnings	$3.357B	$522.0M	$388.0M
YoY Change	53.78%	-2.61%	-33.56%
Net Earnings / Revenue	15.86%	10.28%	7.55%
Basic Earnings Per Share	$5.58	$0.85	$0.63
Diluted Earnings Per Share	$5.57	$0.84	$0.62
COMMON SHARES
Basic Shares Outstanding	601.0M shares	615.6M shares	618.0M shares
Diluted Shares Outstanding	603.0M shares		625.0M shares

Balance Sheet

Concept	2017	2016 Q4	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.273B	$3.305B	$3.446B
YoY Change	-0.97%	8.33%	11.3%
Cash & Equivalents	$1.495B	$1.680B	$1.966B
Short-Term Investments	$1.778B	$1.625B	$1.480B
Other Short-Term Assets	$460.0M	$310.0M	$214.0M
YoY Change	48.39%	64.89%	-69.6%
Inventory	$420.0M	$337.0M	$331.0M
Prepaid Expenses
Receivables	$662.0M	$546.0M	$848.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$4.815B	$4.498B	$4.839B
YoY Change	7.05%	11.78%	5.82%
LONG-TERM ASSETS
Property, Plant & Equipment	$18.54B	$17.04B	$16.55B
YoY Change	8.77%	9.25%	10.83%
Goodwill		$970.0M	$970.0M
YoY Change		0.0%	0.0%
Intangibles		$426.0M	$430.0M
YoY Change		-8.19%	-8.32%
Long-Term Investments
YoY Change
Other Assets	$297.0M	$774.0M	$690.0M
YoY Change	15.12%	7.95%	0.44%
Total Long-Term Assets	$20.30B	$18.79B	$18.21B
YoY Change	8.02%	8.68%	9.77%
TOTAL ASSETS
Total Short-Term Assets	$4.815B	$4.498B	$4.839B
Total Long-Term Assets	$20.30B	$18.79B	$18.21B
Total Assets	$25.11B	$23.29B	$23.05B
YoY Change	7.83%	9.26%	8.91%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$347.0M	$1.178B	$1.021B
YoY Change	33.98%	-0.84%	-17.33%
Accrued Expenses	$1.901B	$1.985B	$2.146B
YoY Change	-6.22%	-23.39%	4.73%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$348.0M	$566.0M	$972.0M
YoY Change	-38.52%	-11.15%	238.68%
Total Short-Term Liabilities	$6.863B	$6.844B	$7.816B
YoY Change	0.28%	-7.59%	10.33%
LONG-TERM LIABILITIES
Long-Term Debt	$3.405B	$2.946B	$2.458B
YoY Change	15.58%	8.87%	-3.42%
Other Long-Term Liabilities	$3.082B	$728.0M	$661.0M
YoY Change	83.34%	-4.21%	-29.0%
Total Long-Term Liabilities	$6.487B	$728.0M	$661.0M
YoY Change	40.2%	-4.21%	-29.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$6.863B	$6.844B	$7.816B
Total Long-Term Liabilities	$6.487B	$728.0M	$661.0M
Total Liabilities	$15.47B	$7.572B	$8.477B
YoY Change	4.2%	-7.27%	5.76%
SHAREHOLDERS EQUITY
Retained Earnings		$11.42B	$10.96B
YoY Change		21.35%	22.81%
Common Stock		$2.218B	$2.210B
YoY Change		1.65%	3.37%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$4.872B	$4.621B
YoY Change		53.11%	44.9%
Treasury Stock Shares		192.5M shares
Shareholders Equity	$9.641B	$7.784B	$8.047B
YoY Change
Total Liabilities & Shareholders Equity	$25.11B	$23.29B	$23.05B
YoY Change	7.83%	9.26%	8.91%

Cashflow Statement

Concept	2017	2016 Q4	2016 Q3
OPERATING ACTIVITIES
Net Income	$3.357B	$522.0M	$388.0M
YoY Change	53.78%	-2.61%	-33.56%
Depreciation, Depletion And Amortization	$1.218B	$318.0M	$315.0M
YoY Change	-0.25%	20.45%	22.57%
Cash From Operating Activities	$3.929B	$709.0M	$856.0M
YoY Change	-8.48%	118.83%	2.39%
INVESTING ACTIVITIES
Capital Expenditures	-$2.249B	-$713.0M	-$497.0M
YoY Change	4.75%	-14.71%	89.69%
Acquisitions
YoY Change
Other Investing Activities	$0.00	-$126.0M	-$5.000M
YoY Change		14.55%
Cash From Investing Activities	-$2.408B	-$839.0M	-$584.0M
YoY Change	5.99%	-11.31%	125.48%
FINANCING ACTIVITIES
Cash Dividend Paid	$274.0M		$62.00M
YoY Change	23.42%		26.53%
Common Stock Issuance & Retirement, Net	$1.600B		$250.0M
YoY Change	-8.57%		-50.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$1.706B	-156.0M	-$346.0M
YoY Change	-11.33%	-133.55%	-43.19%
NET CHANGE
Cash From Operating Activities	$3.929B	709.0M	$856.0M
Cash From Investing Activities	-$2.408B	-839.0M	-$584.0M
Cash From Financing Activities	-$1.706B	-156.0M	-$346.0M
Net Change In Cash	-$185.0M	-286.0M	-$74.00M
YoY Change	-290.72%	82.17%	131.25%
FREE CASH FLOW
Cash From Operating Activities	$3.929B	$709.0M	$856.0M
Capital Expenditures	-$2.249B	-$713.0M	-$497.0M
Free Cash Flow	$6.178B	$1.422B	$1.353B
YoY Change	-4.07%	22.59%	23.22%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000092380
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	587950973	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	37211057645	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	SOUTHWEST AIRLINES CO
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2015	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	4.04	USD
CY2016	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	4.06	USD
CY2017	luv	Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan AggregateCostOfDiscountOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	5.57	USD
CY2016Q4	luv	Aircraft Maintenance Payable AircraftMaintenancePayable	26000000	USD
CY2017Q4	luv	Aircraft Maintenance Payable AircraftMaintenancePayable	38000000	USD
CY2017	luv	Aircraftgroundedduring September2017 AircraftgroundedduringSeptember2017	61	aircraft
CY2015	luv	Aircraftgroundingcharge Aircraftgroundingcharge	0	USD
CY2016	luv	Aircraftgroundingcharge Aircraftgroundingcharge	0	USD
CY2017Q3	luv	Aircraftgroundingcharge Aircraftgroundingcharge	63000000	USD
CY2017	luv	Aircraftgroundingcharge Aircraftgroundingcharge	63000000	USD
CY2016Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	1220000000	USD
CY2017Q4	luv	Assets Constructed For Others AssetsConstructedForOthers	1543000000	USD
CY2016Q4	luv	Assets Constructed For Others Net AssetsConstructedForOthersNet	1156000000	USD
CY2017Q4	luv	Assets Constructed For Others Net AssetsConstructedForOthersNet	1448000000	USD
CY2015	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	192000000	USD
CY2016	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	196000000	USD
CY2017	luv	Assets Constructedfor Others During Period AssetsConstructedforOthersDuringPeriod	197000000	USD
CY2017Q4	luv	Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts CashCollateralPercentOfFairValueFuelDerivativesContracts	1
CY2016	luv	Changein Accounting Estimate Financial Effecton Depreciation Expense Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonDepreciationExpenseDepreciationEstimate	123000000	USD
CY2017	luv	Changein Accounting Estimate Financial Effecton Depreciation Expense Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonDepreciationExpenseDepreciationEstimate	21000000	USD
CY2016	luv	Changein Accounting Estimate Financial Effecton Net Income Depreciation Adjustment ChangeinAccountingEstimateFinancialEffectonNetIncomeDepreciationAdjustment	-66000000	USD
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Depreciation Adjustment ChangeinAccountingEstimateFinancialEffectonNetIncomeDepreciationAdjustment	-19000000	USD
CY2016	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDepreciationEstimate	-0.11
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDepreciationEstimate	-0.03
CY2016	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Diluted Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDilutedDepreciationEstimate	-0.10
CY2017	luv	Changein Accounting Estimate Financial Effecton Net Income Per Share Diluted Depreciation Estimate ChangeinAccountingEstimateFinancialEffectonNetIncomePerShareDilutedDepreciationEstimate	-0.03
CY2016Q4	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	1078000000	USD
CY2017Q4	luv	Construction Obligation Noncurrent ConstructionObligationNoncurrent	1390000000	USD
CY2017	luv	Debt Instrument Agreements Not Publicly Held DebtInstrumentAgreementsNotPubliclyHeld	7	Agreements
CY2016Q4	luv	Deferred Tax Assets Construction Obligation DeferredTaxAssetsConstructionObligation	402000000	USD
CY2017Q4	luv	Deferred Tax Assets Construction Obligation DeferredTaxAssetsConstructionObligation	326000000	USD
CY2017	luv	Defined Contribution Pension Plans Maximum Age Requirement For Paying Medical And Dental Premiums With Accrued Unused Sick Time DefinedContributionPensionPlansMaximumAgeRequirementForPayingMedicalAndDentalPremiumsWithAccruedUnusedSickTime	P65Y
CY2016Q4	luv	Derivative Asset Fair Value Amount Offset Against Collateral Total DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal	120000000	USD
CY2017Q4	luv	Derivative Asset Fair Value Amount Offset Against Collateral Total DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal	136000000	USD
CY2016Q4	luv	Intangible Assets Gross IntangibleAssetsGross	513000000	USD
CY2017Q4	luv	Intangible Assets Gross IntangibleAssetsGross	502000000	USD
CY2017Q4	luv	Letterof Credit Percentof Collateral LetterofCreditPercentofCollateral	1
CY2017Q4	luv	Maximum Sum Of Derivatives Of Counterparty To Be Included In Other MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther	5000000	USD
CY2017Q4	luv	Net Book Value Of Additional Assets Pledged As Collateral In Case Obligations Related To Fuel Derivatives Exceed Certain Thresholds NetBookValueOfAdditionalAssetsPledgedAsCollateralInCaseObligationsRelatedToFuelDerivativesExceedCertainThresholds	2800000000	USD
CY2017	luv	Discount Percentage Off Market Value For Shares Available Under Employee Stock Purchase Plan DiscountPercentageOffMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	0.10
CY2017Q4	luv	Encumbered Aircraft Released EncumberedAircraftReleased	1	aircraft
CY2017Q4	luv	Encumbered Aircraft Remaining EncumberedAircraftRemaining	4	aircraft
CY2016Q4	luv	Fuel Payable FuelPayable	95000000	USD
CY2017Q4	luv	Fuel Payable FuelPayable	123000000	USD
CY2017Q4	luv	New Accounting Pronouncement Estimated Impact Percent NewAccountingPronouncementEstimatedImpactPercent	0.01
CY2016Q4	luv	Noncurrent Lease Related Obligations NoncurrentLeaseRelatedObligations	125000000	USD
CY2017Q4	luv	Noncurrent Lease Related Obligations NoncurrentLeaseRelatedObligations	85000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net OperatingLeasesFutureMinimumPaymentsNet	1027000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net Current OperatingLeasesFutureMinimumPaymentsNetCurrent	257000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net In Five Years OperatingLeasesFutureMinimumPaymentsNetInFiveYears	68000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net In Four Years OperatingLeasesFutureMinimumPaymentsNetInFourYears	114000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net In Three Years OperatingLeasesFutureMinimumPaymentsNetInThreeYears	186000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net In Two Years OperatingLeasesFutureMinimumPaymentsNetInTwoYears	233000000	USD
CY2017Q4	luv	Operating Leases Future Minimum Payments Net Thereafter OperatingLeasesFutureMinimumPaymentsNetThereafter	169000000	USD
CY2017Q4	luv	Percentage Of Employees Represented By Unions Under Collective Bargaining Agreements PercentageOfEmployeesRepresentedByUnionsUnderCollectiveBargainingAgreements	0.049
CY2017	luv	Percentage Of Market Value For Shares Available Under Employee Stock Purchase Plan PercentageOfMarketValueForSharesAvailableUnderEmployeeStockPurchasePlan	0.9
CY2016Q4	luv	Permanentlygroundedaircraftliabilitycurrent Permanentlygroundedaircraftliabilitycurrent	0	USD
CY2017Q4	luv	Permanentlygroundedaircraftliabilitycurrent Permanentlygroundedaircraftliabilitycurrent	34000000	USD
CY2016Q4	luv	Permanentlygroundedaircraftliabilitynoncurrent Permanentlygroundedaircraftliabilitynoncurrent	0	USD
CY2017Q4	luv	Permanentlygroundedaircraftliabilitynoncurrent Permanentlygroundedaircraftliabilitynoncurrent	13000000	USD
CY2017Q4	luv	Permanentlygroundedaircraftliabilitypaidcurrentperiod Permanentlygroundedaircraftliabilitypaidcurrentperiod	3000000	USD
CY2015	luv	Proceeds From Termination Of Interest Rate Derivatives ProceedsFromTerminationOfInterestRateDerivatives	12000000	USD
CY2016	luv	Proceeds From Termination Of Interest Rate Derivatives ProceedsFromTerminationOfInterestRateDerivatives	0	USD
CY2017	luv	Proceeds From Termination Of Interest Rate Derivatives ProceedsFromTerminationOfInterestRateDerivatives	0	USD
CY2015	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	24000000	USD
CY2016	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	107000000	USD
CY2017	luv	Reimbursementforairportconstruction Reimbursementforairportconstruction	126000000	USD
CY2015	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	10000000	USD
CY2016	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	9000000	USD
CY2017	luv	Repayments Of Construction Obligation RepaymentsOfConstructionObligation	10000000	USD
CY2017Q4	luv	Stock Available For Issue Number Employee Stock Purchase Plan StockAvailableForIssueNumberEmployeeStockPurchasePlan	9000000	shares
CY2017	luv	Total Classicaircraftretiredin2017 TotalClassicaircraftretiredin2017	87	aircraft
CY2015Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	36.40
CY2016Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	36.57
CY2017Q4	luv	Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan	50.13
CY2017Q4	luv	Writeoffof Prepaid Rent On Permanently Grounded Aircraft WriteoffofPrepaidRentOnPermanentlyGroundedAircraft	15000000	USD
CY2016Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	546000000	USD
CY2017Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	662000000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1178000000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1320000000	USD
CY2016Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	535000000	USD
CY2017Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	569000000	USD
CY2016Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	138000000	USD
CY2017Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	186000000	USD
CY2016Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	68000000	USD
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	57000000	USD
CY2016Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	188000000	USD
CY2017Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	83000000	USD
CY2016Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	96000000	USD
CY2017Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	100000000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1985000000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1777000000	USD
CY2016Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	55000000	USD
CY2017Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	40000000	USD
CY2016Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	200000000	USD
CY2017Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	201000000	USD
CY2016Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	355000000	USD
CY2017Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	365000000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	9420000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	9690000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-323000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	12000000	USD
CY2017	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P14Y
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1410000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1451000000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	24000000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	218000000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	232000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	224000000	USD
CY2015	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	1005000000	USD
CY2016	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	1045000000	USD
CY2017	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	1001000000	USD
CY2015	us-gaap	Aircraft Rental AircraftRental	238000000	USD
CY2016	us-gaap	Aircraft Rental AircraftRental	229000000	USD
CY2017	us-gaap	Aircraft Rental AircraftRental	198000000	USD
CY2016Q4	us-gaap	Airline Related Inventory AirlineRelatedInventory	337000000	USD
CY2017Q4	us-gaap	Airline Related Inventory AirlineRelatedInventory	420000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	29000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	37000000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	19000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13000000	USD
CY2016Q4	us-gaap	Assets Assets	23286000000	USD
CY2017Q4	us-gaap	Assets Assets	25110000000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	4498000000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	4815000000	USD
CY2015	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	39000000	USD
CY2016	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0	USD
CY2017	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0	USD
CY2016Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	681000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	885000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	79000000	USD
CY2015	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	193000000	USD
CY2016	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	307000000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	233000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	701000000	USD
CY2016Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	923000000	USD
CY2017Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	1207000000	USD
CY2016Q4	us-gaap	Capital Leased Assets Number Of Units CapitalLeasedAssetsNumberOfUnits	51	CapitalLeases
CY2017Q4	us-gaap	Capital Leased Assets Number Of Units CapitalLeasedAssetsNumberOfUnits	69	aircraft
CY2016Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	841000000	USD
CY2017Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	1035000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	930000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	107000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	96000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	100000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	105000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	106000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	416000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	150000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	780000000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Receivable CapitalLeasesFutureMinimumPaymentsReceivable	90000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable CapitalLeasesFutureMinimumPaymentsReceivable	76000000	USD
CY2016Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	82000000	USD
CY2017Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	172000000	USD
CY2015	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	106000000	USD
CY2016	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	111000000	USD
CY2017	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	168000000	USD
CY2015	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2016	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2017	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2016Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	544000000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	654000000	USD
CY2015	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	179000000	USD
CY2016	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	171000000	USD
CY2017	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	173000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1282000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1583000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1680000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1495000000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	301000000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	97000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-185000000	USD
CY2017Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	60000000	shares
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.2850
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.3750
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.4750
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.2850
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3750
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4750
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	807611634	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	807611634	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	808000000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	808000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1868000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2972000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3823000000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1292000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	778000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	904000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1406000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	847000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	976000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	114000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	69000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	72000000	USD
CY2016Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3410000000	USD
CY2017Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3693000000	USD
CY2016Q4	us-gaap	Deferred Air Traffic Revenue DeferredAirTrafficRevenue	3115000000	USD
CY2017Q4	us-gaap	Deferred Air Traffic Revenue DeferredAirTrafficRevenue	3460000000	USD
CY2016Q4	us-gaap	Deferred Compensation Cash Based Arrangements Liability Current DeferredCompensationCashBasedArrangementsLiabilityCurrent	645000000	USD
CY2017Q4	us-gaap	Deferred Compensation Cash Based Arrangements Liability Current DeferredCompensationCashBasedArrangementsLiabilityCurrent	579000000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-97000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	426000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	192000000	USD
CY2016Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	23000000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	25000000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-108000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	456000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1213000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4860000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3279000000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-11000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	30000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	233000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	12000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1486000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	921000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	400000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	274000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	451000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	309000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3374000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2358000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3374000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2358000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	134000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	86000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4726000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3193000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-14000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-9000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-7000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-5000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	7000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	4000000	USD
CY2016	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-38000000	USD
CY2017	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	2000000	USD
CY2015	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	3000000	USD
CY2016	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2015	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	3000000	USD
CY2016	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	3000000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	3000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-256000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-275000000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0450
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0425
CY2017Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0365
CY2015Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	201000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	256000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	275000000	USD
CY2016	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6000000	USD
CY2017	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	8000000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	32000000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	4000000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	37000000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	5000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	101000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	8000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	14000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	12000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	11000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	10000000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-256000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-275000000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0708
CY2016Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0708
CY2017Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0708
CY2015	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	7000000	USD
CY2016	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	9000000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	11000000	USD
CY2015	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	18000000	USD
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	25000000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	32000000	USD
CY2016	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	-1000000	USD
CY2017	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2015	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	11000000	USD
CY2016	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	13000000	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	18000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0519
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2028
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	945000000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	937000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1000000000	USD
CY2016Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	1190000000	USD
CY2017Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	919000000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1015000000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1221000000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1218000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	444000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	283000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	805000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	57000000	USD
CY2017Q4	us-gaap	Derivative Nonmonetary Notional Amount Percent Of Required Need Coverage DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage	0.63
CY2015	us-gaap	Dividends Cash DividendsCash	188000000	USD
CY2016	us-gaap	Dividends Cash DividendsCash	235000000	USD
CY2017	us-gaap	Dividends Cash DividendsCash	285000000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.30
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.58
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.84
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.19
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.80
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.27
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.18
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.79
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.21
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	35000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M3D
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	USD
CY2016	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-173000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-93000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	221000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	94000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-882000000	USD
CY2015Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1649000000	USD
CY2016Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	258000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss	209000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	87000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	89000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	56000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	13000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	12000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	13000000	USD
CY2016Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	20275000000	USD
CY2017Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	21368000000	USD
CY2016Q4	us-gaap	Frequent Flier Liability Current FrequentFlierLiabilityCurrent	1400000000	USD
CY2017Q4	us-gaap	Frequent Flier Liability Current FrequentFlierLiabilityCurrent	1600000000	USD
CY2015	us-gaap	Fuel Costs FuelCosts	3616000000	USD
CY2016	us-gaap	Fuel Costs FuelCosts	3647000000	USD
CY2017	us-gaap	Fuel Costs FuelCosts	3940000000	USD
CY2015	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	124000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	970000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	970000000	USD
CY2015	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2016	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	21000000	USD
CY2017	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3479000000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	816000000	USD
CY2016	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	153000000	USD
CY2017	us-gaap	Gain Loss On Components Excluded From Assessment Of Price Risk Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfPriceRiskFairValueHedgeEffectiveness	135000000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1304000000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	618000000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	809000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3547000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	553000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1170000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	791000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	737000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3251000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1298000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1303000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-237000000	USD
CY2015	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	0	USD
CY2016	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	0	USD
CY2017	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	-1410000000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-1410000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1218000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1241000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1138000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	14000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-2000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-15000000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	66000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	64000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	50000000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	1440000000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	902000000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	992000000	USD
CY2015	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	-570000000	USD
CY2016	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	535000000	USD
CY2017	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	316000000	USD
CY2015	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	88000000	USD
CY2016	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	50000000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	102000000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	961000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	226000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	246000000	USD
CY2015	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	94000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	125000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Air Traffic Revenue IncreaseDecreaseInDeferredAirTrafficRevenue	345000000	USD
CY2015	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	109000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-455000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1212000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-103000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	119000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	262000000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	6000000	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	5000000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2016	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
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	426000000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	413000000	USD
CY2015	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	31000000	USD
CY2016	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	47000000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	49000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	121000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	122000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	114000000	USD
CY2015	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	4000000	USD
CY2016	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	2000000	USD
CY2017	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	105000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	100000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	81000000	USD
CY2016Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	57000000	USD
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	45000000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	9000000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	24000000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	35000000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	6383000000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	6798000000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	7319000000	USD
CY2015	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	1166000000	USD
CY2016	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	1211000000	USD
CY2017	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	1292000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	909000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	932000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	939000000	USD
CY2017Q4	us-gaap	Lease Incentive Receivable LeaseIncentiveReceivable	105000000	USD
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	167000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	23286000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	25110000000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	6844000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	6905000000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2821000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	3320000000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	566000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	348000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal After Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive	1200000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive	473000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Four LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour	169000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Three LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree	817000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Two LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo	586000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Repayments Of Principal In Next Twelve Months LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths	335000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1024000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1924000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1706000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1913000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2272000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2408000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3238000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4293000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3929000000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	2181000000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	513000000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	820000000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	388000000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	522000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	2244000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	351000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	746000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	503000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	1888000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3488000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2185000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2246000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	3488000000	USD
CY2015	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	172000000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	0	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	0	USD
CY2015	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Basic Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare	0.34
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Basic Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare	0.47
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Basic Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare	0.82
CY2015	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Diluted Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare	0.34
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Diluted Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare	0.46
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Diluted Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare	0.82
CY2015	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Net Income NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome	227000000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Net Income NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome	293000000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Net Income NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome	496000000	USD
CY2015	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Operating Results NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults	427000000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Operating Results NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults	544000000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Operating Results NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults	544000000	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	20000000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-637000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-213000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-264000000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	15704000000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	16665000000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	17656000000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	4116000000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	944000000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1276000000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	695000000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	846000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	3760000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	658000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1250000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	834000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	773000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	3515000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1371000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	359000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	85000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	155000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	264000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	331000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	177000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	344000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	102000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	17000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	41000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	78000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	98000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	8000000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	237000000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	346000000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	774000000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	786000000	USD
CY2016Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	138000000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-556000000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	161000000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	774000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	786000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-313000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	728000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	335000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	12000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	23000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	7000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	13000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	5000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	5000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	9000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8000000	USD
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2242000000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2514000000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2688000000	USD
CY2016Q4	us-gaap	Other Deferred Compensation Arrangements Liability Classified Noncurrent OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent	204000000	USD
CY2017Q4	us-gaap	Other Deferred Compensation Arrangements Liability Classified Noncurrent OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent	237000000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	728000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	707000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-162000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-234000000	USD
CY2015	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-462000000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-165000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-121000000	USD
CY2015	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1170000000	USD
CY2016	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1660000000	USD
CY2017	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1857000000	USD
CY2016Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	108000000	USD
CY2017Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	76000000	USD
CY2015	us-gaap	Passenger Revenue PassengerRevenue	18299000000	USD
CY2016	us-gaap	Passenger Revenue PassengerRevenue	18594000000	USD
CY2017	us-gaap	Passenger Revenue PassengerRevenue	19141000000	USD
CY2015	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	102000000	USD
CY2016	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	109000000	USD
CY2017	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	126000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	7000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1180000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1750000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1600000000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	180000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	222000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	274000000	USD
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2041000000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2038000000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2123000000	USD
CY2015	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1986000000	USD
CY2016	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	2388000000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	2380000000	USD
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	256000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	275000000	USD
CY2017Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	1800000000	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	310000000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	460000000	USD
CY2017Q4	us-gaap	Price Risk Cash Flow Hedge Unrealized Gain Loss To Be Reclassified During Next12 Months PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months	-11000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	500000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	515000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	600000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-23000000	USD
CY2016	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
CY2015	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2223000000	USD
CY2016	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2263000000	USD
CY2017	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2221000000	USD
CY2015	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	46000000	USD
CY2016	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	29000000	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	29000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	26464000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	28229000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	17044000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18539000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	3779000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	4399000000	USD
CY2016Q4	us-gaap	Property Subject To Or Available For Operating Lease Number Of Units PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits	83	aircraft
CY2015	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	0	USD
CY2016	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	68000000	USD
CY2017	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	0	USD
CY2015	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	213000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	523000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	592000000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	11418000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	14621000000	USD
CY2015	us-gaap	Revenues Revenues	19820000000	USD
CY2016Q1	us-gaap	Revenues Revenues	4826000000	USD
CY2016Q2	us-gaap	Revenues Revenues	5384000000	USD
CY2016Q3	us-gaap	Revenues Revenues	5139000000	USD
CY2016Q4	us-gaap	Revenues Revenues	5076000000	USD
CY2016	us-gaap	Revenues Revenues	20425000000	USD
CY2017Q1	us-gaap	Revenues Revenues	4883000000	USD
CY2017Q2	us-gaap	Revenues Revenues	5744000000	USD
CY2017Q3	us-gaap	Revenues Revenues	5271000000	USD
CY2017Q4	us-gaap	Revenues Revenues	5274000000	USD
CY2017	us-gaap	Revenues Revenues	21171000000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	30000000	shares
CY2016Q4	us-gaap	Short Term Investments ShortTermInvestments	1625000000	USD
CY2017Q4	us-gaap	Short Term Investments ShortTermInvestments	1778000000	USD
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	597000	shares
CY2016	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	622000	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	544000	shares
CY2016	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	43000000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	30000000	USD
CY2016	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	20000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	14000000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	29000000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	33000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	37000000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	6775000000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	7358000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	8441000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	10430000000	USD
CY2016Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	184000000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	203000000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	192450855	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	219060856	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4872000000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	6462000000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1180000000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1750000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1600000000	USD
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	113000000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-200000000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-50000000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	669000000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	633000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	603000000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	661000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	627000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	601000000	shares
CY2016Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	183000000	USD
CY2017Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	172000000	USD
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-indent:16px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-style:italic;font-weight:bold;">Concentration Risk</font></div><div style="line-height:120%;text-indent:16px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">Approximately </font><font style="font-family:Times New Roman;font-size:11pt;color:#000000;font-style:normal;font-weight:normal;text-decoration:none;">83 percent</font><font 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 small percentage of the Company's unionized Employees, including its Mechanics and Material Specialists, are in discussions on labor agreements. Those unionized Employee groups in discussions represent approximately </font><font style="font-family:inherit;font-size:11pt;">4.9 percent</font><font style="font-family:inherit;font-size:11pt;"> of the Company’s full-time equivalent Employees as of </font><font style="font-family:inherit;font-size:11pt;">December 31, 2017</font><font style="font-family:inherit;font-size:11pt;">. </font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font 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.</font></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font 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 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 </font><font style="font-family:inherit;font-size:11pt;">Note 10</font><font style="font-family:inherit;font-size:11pt;"> for further information.</font></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">As of </font><font style="font-family:Times New Roman;font-size:11pt;color:#000000;font-style:normal;font-weight:normal;text-decoration:none;">December 31, 2017</font><font style="font-family:inherit;font-size:11pt;">, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. If the Company was unable to acquire additional aircraft or associated aircraft parts from Boeing, or Boeing was unable or unwilling to make timely deliveries of aircraft or to provide adequate support for its products, the Company’s operations would be materially adversely impacted. In addition, the Company would be materially adversely impacted in the event of a mechanical or regulatory issue associated with the Boeing 737 aircraft type, whether as a result of downtime for part or all of the Company’s fleet, increased maintenance costs, or because of a negative perception by the flying public. The Company is also dependent on sole suppliers for aircraft engines and certain other aircraft parts and would, therefore, also be materially adversely impacted in the event of the unavailability of, or a mechanical or regulatory issue associated with, engines and other parts.</font></div><div style="line-height:120%;text-align:justify;text-indent:41px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font 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, none of which currently extend beyond </font><font style="font-family:inherit;font-size:11pt;">May 2022</font><font style="font-family:inherit;font-size:11pt;">. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.</font></div></div>

Files In Submission

Name	View Source	Status
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0000092380-18-000031-index.html	Edgar Link	pending
0000092380-18-000031.txt	Edgar Link	pending
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chart.jpg	Edgar Link	pending
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Financial_Report.xlsx	Edgar Link	pending
luv-12312017x10k.htm	Edgar Link	pending
luv-12312017xex101.htm	Edgar Link	pending
luv-12312017xex21.htm	Edgar Link	pending
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luv-12312017xex32.htm	Edgar Link	pending
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$LUV
SOUTHWEST AIRLINES CO Stock $luv

2017 Form 10-K Financial Statement

#000009238018000031 Filed on February 07, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV SOUTHWEST AIRLINES CO Stock $luv

2017 Form 10-K Financial Statement

#000009238018000031 Filed on February 07, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LUV
SOUTHWEST AIRLINES CO Stock $luv