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Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 05, 2022
defendant
Jun. 08, 2021
USD ($)
Apr. 30, 2022
USD ($)
Feb. 28, 2021
USD ($)
Mar. 31, 2022
USD ($)
country
Brazil Tax Matters          
Loss Contingencies          
Damages sought, value         $ 450
CISGIL v. IBM UK          
Loss Contingencies          
Amount of award against IBM       $ 20  
CISGIL v. IBM UK | Expected          
Loss Contingencies          
Additional damages sought, value     $ 89    
Putative Securities Class Action | Expected          
Loss Contingencies          
Number of current executives named as defendants | defendant 2        
Number of former executives named as defendants | defendant 2        
Minimum          
Loss Contingencies          
Clients' presence in number of countries | country         175
Minimum | IBM v. GF          
Loss Contingencies          
Damages sought, value   $ 1,500