XML 41 R30.htm IDEA: XBRL DOCUMENT
v3.19.2

Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions | Jun. 30, 2019 gal | [1]
--- | --- | ---
Remainder of Current Year |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 687
2020 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 1,301
2021 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 930
2022 |
Volume of Fuel Hedging |
Fuel Hedged (in gallons) | 227
[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 and may vary significantly as market prices fluctuate.

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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
- 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_ThirdYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |