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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Operating revenue	$ 16,658	$ 15,578	$ 30,406	$ 28,337
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,618	2,201	5,057	4,340
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,251	965	2,436	1,882
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	836	774	1,631	1,500
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	213	214	393	445
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 318	$ 248	$ 597	$ 513

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