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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
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,
2021202020212020
Domestic (U.S. and Canada)$5,412 $1,672 $11,290 $7,675 
Atlantic1,116 365 2,111 1,799 
Pacific373 282 1,073 1,346 
Latin America849 170 1,968 1,123 
Total$7,750 $2,489 $16,442 $11,943 
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,
2021202020212020
Total Frequent flyer deferred revenue - beginning balance$6,185 $5,670 $5,975 $5,276 
Total miles awarded439 268 1,071 1,056 
Travel miles redeemed (Passenger revenue)(391)(87)(781)(444)
Non-travel miles redeemed (Other operating revenue)(16)(16)(48)(53)
Total Frequent flyer deferred revenue - ending balance$6,217 $5,835 $6,217 $5,835