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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 15,488	$ 13,975	$ 43,825	$ 37,147
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,215	2,271	6,555	7,017
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	935	1,134	2,817	3,835
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	791	655	2,291	1,877
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	212	249	657	665
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 277	$ 233	$ 790	$ 640

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