XML 83 R30.htm IDEA: XBRL DOCUMENT
v3.19.3

Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions | Sep. 30, 2019 gal | [1]
--- | --- | ---
Remainder of Current Year |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 344
2020 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 1,301
2021 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 1,169
2022 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 552
[1] | Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place.

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | luv_VolumeOfFuelHedgingLineItems
Namespace Prefix: | luv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal number of units used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | luv_VolumeOfFuelHedgingAxis=luv_CurrentYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | luv_VolumeOfFuelHedgingAxis=luv_NextYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | luv_VolumeOfFuelHedgingAxis=luv_YearTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | luv_VolumeOfFuelHedgingAxis=luv_YearThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |