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REVENUE RECOGNITION - Schedule of Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 15,225	$ 14,843	$ 43,673	$ 42,368
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	8,990	8,648	25,808	25,082
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	3,486	3,432	8,755	8,542
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	1,568	1,531	5,009	4,721
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 1,181	$ 1,232	$ 4,100	$ 4,023

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