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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Operating revenue	$ 15,677	$ 15,488	$ 46,084	$ 43,825
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,374	2,215	7,431	6,555
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,083	935	3,520	2,817
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	820	791	2,451	2,291
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	161	212	554	657
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 310	$ 277	$ 906	$ 790

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