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SEGMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information, Profit (Loss)        
Operating revenue $ 15,488 $ 13,975 $ 43,825 $ 37,147
Intersegment Sales/Other | Exchanged products        
Segment Reporting Information, Profit (Loss)        
Operating revenue $ (519) $ (834) $ (1,848) $ (2,623)