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Contingencies (Details)
$ in Millions
1 Months Ended 9 Months Ended
Jun. 08, 2021
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2021
USD ($)
country
Oct. 30, 2017
claim
Brazil Tax Matters        
Loss Contingencies        
Damages sought, value     $ 400  
SCO v. IBM        
Loss Contingencies        
Number of remaining claims | claim       1
CISGIL v. IBM UK        
Loss Contingencies        
Amount of award against IBM   $ 20    
Minimum        
Loss Contingencies        
Clients' presence in number of countries | country     175  
Minimum | IBM v. GF        
Loss Contingencies        
Damages sought, value $ 1,500