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Revenue - Schedule of Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 14,986	$ 14,178	$ 27,525	$ 25,607
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	8,761	8,417	16,434	15,584
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	3,277	3,229	5,110	5,061
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	1,346	1,273	2,791	2,589
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 1,602	$ 1,259	$ 3,190	$ 2,373

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