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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 02, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-7259    
Entity Registrant Name SOUTHWEST AIRLINES CO.    
Entity Incorporation, State or Country Code TX    
Entity Tax Identification Number 74-1563240    
Entity Address, Address Line One P.O. Box 36611    
Entity Address, City or Town Dallas,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75235-1611    
City Area Code 214    
Local Phone Number 792-4000    
Title of 12(b) Security Common Stock ($1.00 par value)    
Trading Symbol LUV    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 31,305,364,914
Entity Common Stock, Shares Outstanding   592,341,878  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Definitive Proxy Statement for the Company’s Annual Meeting of Shareholders to be held May 18, 2022, are incorporated into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0000092380    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false