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Revenue - Schedule of Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 12,539	$ 11,429
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	7,673	7,167
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	1,833	1,832
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	1,445	1,316
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 1,588	$ 1,114

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