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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Operating revenue	$ 14,040	$ 13,748
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,352	2,439
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,062	1,185
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	807	795
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	189	180
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 294	$ 279

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