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REVENUE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Lease & related maintenance and rental revenue $ 966 $ 948 $ 1,911 $ 1,884
Contract with customer, revenue, remaining performance obligation 3,200   3,200  
Maintenance Services        
Disaggregation of Revenue [Line Items]        
Lease & related maintenance and rental revenue $ 248 $ 241 $ 498 $ 484