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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Revenue Recognition and Deferred Revenue [Abstract]
ATL - PAX Revenue and Ancillary PAX Services	$ 3,109	$ 2,686
AirTrafficLiabilityLoyaltyProgram	4,623	4,447
AirTrafficLiabilityTotal	$ 7,732	$ 7,133	$ 6,211	$ 5,510

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- Definition

Air Traffic Liability Loyalty Program

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No definition available.

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- Definition

Air Traffic Liability Passenger Revenue and Ancillary Passenger Services

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- Definition

Air Traffic Liability Total

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Name:	luv_AirTrafficLiabilityTotal
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