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Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 1,136 us-gaap_NetIncomeLoss | $ 754 us-gaap_NetIncomeLoss | $ 421 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Depreciation and amortization | 938 us-gaap_DepreciationAndAmortization | 867 us-gaap_DepreciationAndAmortization | 844 us-gaap_DepreciationAndAmortization
Unrealized (gain) loss on fuel derivative instruments | 279 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | (5)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | (189)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Deferred income taxes | 501 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 50 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 251 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Changes in certain assets and liabilities: |  |  |
Accounts and other receivables | 54 us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables | (17)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables | (33)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Other assets | 142 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (46)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (104)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities | 36 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 343 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 186 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Air traffic liability | 326 us-gaap_IncreaseDecreaseInDeferredAirTrafficRevenue | 400 us-gaap_IncreaseDecreaseInDeferredAirTrafficRevenue | 334 us-gaap_IncreaseDecreaseInDeferredAirTrafficRevenue
Cash collateral received from (provided to) derivative counterparties | (233)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties | 57 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties | 233 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties
Other, net | (277)us-gaap_OtherOperatingActivitiesCashFlowStatement | 74 us-gaap_OtherOperatingActivitiesCashFlowStatement | 121 us-gaap_OtherOperatingActivitiesCashFlowStatement
Net cash provided by operating activities | 2,902 us-gaap_NetCashProvidedByUsedInOperatingActivities | 2,477 us-gaap_NetCashProvidedByUsedInOperatingActivities | 2,064 us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash used in investing activities |  |  |
Capital expenditures | (1,748)us-gaap_PaymentsToAcquireProductiveAssets | (1,433)us-gaap_PaymentsToAcquireProductiveAssets | (1,348)us-gaap_PaymentsToAcquireProductiveAssets
Assets constructed for others | (80)us-gaap_PaymentsForConstructionInProcess |  | 0 us-gaap_PaymentsForConstructionInProcess
Prior Period Reclassification Adjustment |  | 14 us-gaap_PriorPeriodReclassificationAdjustment |
Purchases of short-term investments | (3,080)us-gaap_PaymentsToAcquireShortTermInvestments | (3,135)us-gaap_PaymentsToAcquireShortTermInvestments | (2,481)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sales of short-term and other investments | 3,185 luv_ProceedsFromSaleOfShortTermAndOtherInvestments | 3,198 luv_ProceedsFromSaleOfShortTermAndOtherInvestments | 2,996 luv_ProceedsFromSaleOfShortTermAndOtherInvestments
Other, net | (4)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities | (1,727)us-gaap_NetCashProvidedByUsedInInvestingActivities | (1,384)us-gaap_NetCashProvidedByUsedInInvestingActivities | (833)us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in financing activities |  |  |
Proceeds from issuance of long-term debt | 300 us-gaap_ProceedsFromIssuanceOfDebt | 0 us-gaap_ProceedsFromIssuanceOfDebt | 0 us-gaap_ProceedsFromIssuanceOfDebt
Proceeds from Employee stock plans | 110 us-gaap_ProceedsFromStockPlans | 96 us-gaap_ProceedsFromStockPlans | 27 us-gaap_ProceedsFromStockPlans
Reimbursement for assets constructed for others | 27 luv_Reimbursementforairportconstruction | 0 luv_Reimbursementforairportconstruction | 0 luv_Reimbursementforairportconstruction
Proceeds from termination of interest rate derivative instrument | 0 luv_ProceedsFromTerminationOfInterestRateDerivatives | 0 luv_ProceedsFromTerminationOfInterestRateDerivatives | 38 luv_ProceedsFromTerminationOfInterestRateDerivatives
Payments of long-term debt and capital lease obligations | (561)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities | (313)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities | (578)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Payments of cash dividends | (139)us-gaap_PaymentsOfDividendsCommonStock | (71)us-gaap_PaymentsOfDividendsCommonStock | (22)us-gaap_PaymentsOfDividendsCommonStock
Repayment of construction obligation | (11)luv_RepaymentsOfConstructionObligation | (5)luv_RepaymentsOfConstructionObligation | 0 luv_RepaymentsOfConstructionObligation
Repurchase of common stock | (955)us-gaap_PaymentsForRepurchaseOfCommonStock | (540)us-gaap_PaymentsForRepurchaseOfCommonStock | (400)us-gaap_PaymentsForRepurchaseOfCommonStock
Other, net | (19)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (18)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (12)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities | (1,248)us-gaap_NetCashProvidedByUsedInFinancingActivities | (851)us-gaap_NetCashProvidedByUsedInFinancingActivities | (947)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET CHANGE IN CASH AND CASH EQUIVALENTS | (73)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 242 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 284 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 1,355 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,113 us-gaap_CashAndCashEquivalentsAtCarryingValue | 829 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 1,282 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,355 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,113 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH PAYMENTS FOR: |  |  |
Interest | 128 us-gaap_InterestPaidNet | 133 us-gaap_InterestPaidNet | 153 us-gaap_InterestPaidNet
Income taxes | 155 us-gaap_IncomeTaxesPaid | 346 us-gaap_IncomeTaxesPaid | 100 us-gaap_IncomeTaxesPaid
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS: |  |  |
Assets constructed for others | $ 88 luv_AssetsConstructedforOthersDuringPeriod | $ 105 luv_AssetsConstructedforOthersDuringPeriod | $ 129 luv_AssetsConstructedforOthersDuringPeriod

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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