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Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2021
USD ($)
May 31, 2015
defendant
Mar. 31, 2021
USD ($)
country
Oct. 30, 2017
claim
Brazil Tax Matters        
Loss Contingencies        
Damages sought, value     $ 700  
SCO v. IBM        
Loss Contingencies        
Number of remaining claims | claim       1
Litigation Case In United States District Court regarding divesting Microelectronics business, alleging violations of the Employee Retirement Income Security Act        
Loss Contingencies        
Number of officers or executives named as defendants | defendant   3    
CISGIL v. IBM UK        
Loss Contingencies        
Amount of award against IBM $ 20      
Minimum        
Loss Contingencies        
Clients' presence in number of countries | country     175