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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Lease & related maintenance and rental revenues $ 1,013,968 $ 933,771 $ 2,941,084 $ 2,730,187
Contract with customer, revenue, remaining performance obligation 2,400,000   2,400,000  
Maintenance Services        
Disaggregation of Revenue [Line Items]        
Lease & related maintenance and rental revenues $ 255,000 $ 241,000 $ 765,000 $ 719,000