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Revenue - Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 14,484	$ 12,877	$ 40,091	$ 32,555
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	8,379	7,718	23,963	20,623
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	3,543	3,186	8,604	6,756
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	1,184	1,162	3,773	3,266
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 1,378	$ 811	$ 3,751	$ 1,910

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