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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Operating revenue	$ 16,673	$ 15,677	$ 47,361	$ 46,084
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,934	2,374	7,855	7,431
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,476	1,083	3,680	3,520
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	847	820	2,509	2,451
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	256	161	710	554
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 355	$ 310	$ 956	$ 906

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