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Separation of Kyndryl - Net Impact to stockholders equity (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 03, 2021
Dec. 31, 2021
Divestitures    
Shares retained (as percent) 19.90%  
Kyndryl Holdings, Inc    
Divestitures    
Ownership interest by stockholders (in percent) 19.90%  
Shares retained, net book value $ 681  
Managed infrastructure services unit | Disposed by separation    
Divestitures    
Increase in stockholders equity   $ (7,203)
Managed infrastructure services unit | Disposed by separation | Retained Earnings    
Divestitures    
Increase in stockholders equity   (8,404)
Managed infrastructure services unit | Disposed by separation | Accumulated Other Comprehensive Income/(Loss)    
Divestitures    
Increase in stockholders equity   1,264
Managed infrastructure services unit | Disposed by separation | Non-Controlling Interests    
Divestitures    
Increase in stockholders equity   $ (62)