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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ATL - PAX Revenue and Ancillary PAX Services	$ 2,059	$ 1,898
ATL - Loyalty Program	3,011	2,667
Air Traffic Liability Total	$ 5,070	$ 4,565	$ 4,221

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- Definition

Air Traffic Liability Loyalty Program

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No definition available.

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Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Air Traffic Liability Passenger Revenue and Ancillary Passenger Services

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No definition available.

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Name:	luv_AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Air Traffic Liability Total

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No definition available.

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Name:	luv_AirTrafficLiabilityTotal
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant