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Revenue (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
20242023
Domestic (U.S. and Canada)$7,673 $7,167 
Atlantic1,833 1,832 
Latin America1,445 1,316 
Pacific1,588 1,114 
Total$12,539 $11,429 
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 March 31,
20242023
Total Frequent flyer deferred revenue - beginning balance$7,143 $6,675 
Total miles awarded840 747 
Travel miles redeemed(665)(531)
Non-travel miles redeemed(39)(31)
Total Frequent flyer deferred revenue - ending balance$7,279 $6,860