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Revenue (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Operating Revenue by Geographic Region The table below presents the Company's operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Domestic (U.S. and Canada)$8,761 $8,417 $16,434 $15,584 
Atlantic3,277 3,229 5,110 5,061 
Latin America1,346 1,273 2,791 2,589 
Pacific1,602 1,259 3,190 2,373 
Total$14,986 $14,178 $27,525 $25,607 
Schedule of Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Total Frequent flyer deferred revenue - beginning balance$7,279 $6,860 $7,143 $6,675 
Total miles awarded919 902 1,759 1,649 
Travel miles redeemed(818)(712)(1,483)(1,243)
Non-travel miles redeemed(27)(26)(66)(57)
Total Frequent flyer deferred revenue - ending balance$7,353 $7,024 $7,353 $7,024