XML 63 R43.htm IDEA: XBRL DOCUMENT v3.21.1

Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Air Traffic Liability Roll Forward
ATL, beginning balance	$ 7,133	$ 5,510
Current Period Sales	2,324	4,565
Revenue amounts in beginning balance	(743)	(1,949)
Revenue from Current Period Sales	(982)	(1,915)
ATL, ending balance	$ 7,732	$ 6,211

X

- Definition

Current Period Sales

+ References

No definition available.

+ Details

Name:	luv_AirTrafficLiabilityCurrentPeriodSales
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Air Traffic Liability - Revenue amounts in beginning balance

+ References

No definition available.

+ Details

Name:	luv_AirTrafficLiabilityRevenueamountsinbeginningbalance
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Air Traffic Liability - Revenue from Current Period Sales

+ References

No definition available.

+ Details

Name:	luv_AirTrafficLiabilityRevenuefromCurrentPeriodSales
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Air Traffic Liability Roll Forward

+ References

No definition available.

+ Details

Name:	luv_AirTrafficLiabilityRollForwardRollForward
Namespace Prefix:	luv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Air Traffic Liability Total

+ References

No definition available.

+ Details

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