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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 12,759	$ 9,348
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,139	2,152
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	916	1,187
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	726	571
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	231	209
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 266	$ 185

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