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RELATED PARTY TRANSACTIONS - Related Party Revenue and Purchases (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]        
Revenues   $ 704 $ 645 $ 613
Related party cost   3,979 3,767 3,592
Cost of services [1]   16,570 17,143 17,682
Payment for purchase of hardware from IBM   752 1,036 1,190
Depreciation   1,300 1,445 1,469
IBM        
Related Party Transaction [Line Items]        
Revenues   704 645 613
IBM | Hardware, software and services        
Related Party Transaction [Line Items]        
Cost of services   2,800 2,700 2,600
Payment for purchase of hardware from IBM   299 504 526
Depreciation   447 520 538
Due from related party $ 265 $ 265    
Upgraded hardware period   2 years    
Estimated useful lives (in years)   5 years    
IBM | Networking and IT services        
Related Party Transaction [Line Items]        
Cost of services   $ 384 509 484
IBM | Outsourcing        
Related Party Transaction [Line Items]        
Cost of services $ 312      
IBM | Cost of service        
Related Party Transaction [Line Items]        
Related party cost   $ 4,000 $ 3,800 $ 3,600
[1] Including related-party cost of service of $3,979 in 2021, $3,767 in 2020 and $3,592 in 2019