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RELATED PARTY TRANSACTIONS - Related Party Revenue and Purchases (Details)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 11, 2022
item
May 19, 2022
item
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Related Party Transaction [Line Items]              
Revenues     $ 82 $ 144 $ 287 $ 291  
Related-party cost of services     421 966 1,382 1,872  
Cost of services     3,613 4,071 7,290 8,233  
Depreciation     221 335 449 666  
Payment for purchase of hardware from IBM         466 420  
Property and equipment, net     2,592   2,592   $ 2,834
IBM              
Related Party Transaction [Line Items]              
Ownership interest transferred 19.90% 19.90%          
Number of transactions pursuant to exchange agreement | item 2 2          
Revenues     82 144 287 291  
IBM | Outsourcing              
Related Party Transaction [Line Items]              
Cost of services     421 966 1,382 1,872  
IBM | Networking and IT services              
Related Party Transaction [Line Items]              
Cost of services       114   229  
IBM | Hardware, software and services              
Related Party Transaction [Line Items]              
Cost of services       739   1,420  
Depreciation       114   223  
Payment for purchase of hardware from IBM         89 197  
Due from related party     265   $ 265    
Upgraded hardware period         2 years    
Purchases from related party     $ 21   $ 21    
Estimated useful lives (in years)     5 years        
IBM | Cost of service              
Related Party Transaction [Line Items]              
Related-party cost of services     $ 421 $ 966 $ 1,382 $ 1,872