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REVENUE RECOGNITION - Schedule of Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 57,063	$ 53,717	$ 44,955
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	34,067	32,400	28,474
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	11,097	10,982	9,072
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	6,462	5,267	2,927
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 5,437	$ 5,068	$ 4,482

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