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Revenue (Tables)
 9 Months Ended
Sep. 30, 2023
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 September 30,Nine Months Ended
September 30,
2023202220232022
Domestic (U.S. and Canada)$8,379 $7,718 $23,963 $20,623 
Atlantic3,543 3,186 8,604 6,756 
Latin America1,184 1,162 3,773 3,266 
Pacific1,378 811 3,751 1,910 
Total$14,484 $12,877 $40,091 $32,555 
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 September 30,Nine Months Ended
September 30,
2023202220232022
Total Frequent flyer deferred revenue - beginning balance$7,024 $6,495 $6,675 $6,282 
Total miles awarded816 705 2,465 1,848 
Travel miles redeemed(740)(601)(1,983)(1,489)
Non-travel miles redeemed(24)(21)(81)(63)
Total Frequent flyer deferred revenue - ending balance$7,076 $6,578 $7,076 $6,578