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Revenue (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2021202020212020
Domestic (U.S. and Canada)$3,767 $925 $5,878 $6,003 
Atlantic585 219 995 1,434 
Pacific392 258 700 1,064 
Latin America727 73 1,119 953 
Total$5,471 $1,475 $8,692 $9,454 
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,
2021202020212020
Total Frequent flyer deferred revenue - beginning balance$6,109 $5,488 $5,975 $5,276 
Total miles awarded360 228 632 787 
Travel miles redeemed (Passenger revenue)(267)(34)(390)(356)
Non-travel miles redeemed (Other operating revenue)(17)(12)(32)(37)
Total Frequent flyer deferred revenue - ending balance$6,185 $5,670 $6,185 $5,670