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	$ 1,136us-gaap_NetIncomeLoss	$ 754us-gaap_NetIncomeLoss	$ 421us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	938us-gaap_DepreciationAndAmortization	867us-gaap_DepreciationAndAmortization	844us-gaap_DepreciationAndAmortization
Unrealized (gain) loss on fuel derivative instruments	279	(5)	(189)
Deferred income taxes	501	50	251
Changes in certain assets and liabilities:
Accounts and other receivables	54	(17)	(33)
Other assets	142	(46)	(104)
Accounts payable and accrued liabilities	36	343	186
Air traffic liability	326	400	334
Cash collateral received from (provided to) derivative counterparties	(233)	57	233
Other, net	(277)	74	121
Net cash provided by operating activities	2,902	2,477	2,064
Net cash used in investing activities
Capital expenditures	(1,748)	(1,433)	(1,348)
Assets constructed for others	(80)		0
Prior Period Reclassification Adjustment		14
Purchases of short-term investments	(3,080)	(3,135)	(2,481)
Proceeds from sales of short-term and other investments	3,185	3,198	2,996
Other, net	(4)	0	0
Net cash used in investing activities	(1,727)	(1,384)	(833)
Net cash used in financing activities
Proceeds from issuance of long-term debt	300us-gaap_ProceedsFromIssuanceOfDebt	0us-gaap_ProceedsFromIssuanceOfDebt	0us-gaap_ProceedsFromIssuanceOfDebt
Proceeds from Employee stock plans	110us-gaap_ProceedsFromStockPlans	96us-gaap_ProceedsFromStockPlans	27us-gaap_ProceedsFromStockPlans
Reimbursement for assets constructed for others	27luv_Reimbursementforairportconstruction	0luv_Reimbursementforairportconstruction	0luv_Reimbursementforairportconstruction
Proceeds from termination of interest rate derivative instrument	0	0	38
Payments of long-term debt and capital lease obligations	(561)	(313)	(578)
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	0luv_RepaymentsOfConstructionObligation
Repurchase of common stock	(955)	(540)	(400)
Other, net	(19)	(18)	(12)
Net cash used in financing activities	(1,248)	(851)	(947)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(73)	242	284
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,355	1,113	829
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,282	1,355	1,113
CASH PAYMENTS FOR:
Interest	128us-gaap_InterestPaidNet	133us-gaap_InterestPaidNet	153us-gaap_InterestPaidNet
Income taxes	155us-gaap_IncomeTaxesPaid	346us-gaap_IncomeTaxesPaid	100us-gaap_IncomeTaxesPaid
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:
Assets constructed for others	$ 88	$ 105	$ 129

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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

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