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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Operating revenue	$ 16,648	$ 16,658	$ 30,688	$ 30,406
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,569	2,618	4,920	5,057
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,141	1,251	2,203	2,436
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	855	836	1,662	1,631
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	264	213	453	393
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 309	$ 318	$ 602	$ 597

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