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Revenue - Schedule of Operating Revenue by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Total operating revenue $ 14,843 $ 14,484 $ 42,368 $ 40,091
Domestic (U.S. and Canada)        
Disaggregation of Revenue [Line Items]        
Total operating revenue 8,648 8,379 25,082 23,963
Atlantic        
Disaggregation of Revenue [Line Items]        
Total operating revenue 3,432 3,543 8,542 8,604
Latin America        
Disaggregation of Revenue [Line Items]        
Total operating revenue 1,232 1,184 4,023 3,773
Pacific        
Disaggregation of Revenue [Line Items]        
Total operating revenue $ 1,531 $ 1,378 $ 4,721 $ 3,751