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TRANSACTIONS WITH FORMER PARENT - Related Party Revenue and Purchases (Details) - USD ($)
$ in Millions
3 Months Ended 11 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Aug. 11, 2022
Related Party Transaction [Line Items]        
Revenues $ 4,193 $ 4,288    
Cost of services 3,449 3,677    
Payment for purchase of hardware from IBM 100 213    
Related Party        
Related Party Transaction [Line Items]        
Revenues   205    
Cost of services   961    
IBM        
Related Party Transaction [Line Items]        
Ownership interest transferred       19.90%
IBM | Hardware, software and services        
Related Party Transaction [Line Items]        
Purchases from related party 26   $ 110  
IBM | Cost of service        
Related Party Transaction [Line Items]        
Cost of services 0      
IBM | Related Party        
Related Party Transaction [Line Items]        
Revenues 0 205    
IBM | Related Party | Outsourcing        
Related Party Transaction [Line Items]        
Cost of services   961    
IBM | Related Party | Hardware, software and services        
Related Party Transaction [Line Items]        
Payment for purchase of hardware from IBM   61    
Due from related party $ 265   $ 265  
Upgraded hardware period 2 years      
Estimated useful lives (in years) 5 years   5 years  
IBM | Related Party | Cost of service        
Related Party Transaction [Line Items]        
Cost of services   $ 961