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Contingencies (Details)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 07, 2017
USD ($)
Feb. 13, 2014
USD ($)
Jul. 18, 2012
USD ($)
May 31, 2015
defendant
Sep. 30, 2018
USD ($)
country
claim
Oct. 30, 2017
claim
SCO v. IBM            
Loss Contingencies            
Number of remaining claims | claim           1
IBM v. State Of Indiana            
Loss Contingencies            
Duration of trial     42 days      
Amount of award to IBM   $ 50 $ 52      
Amount of award against IBM $ 128          
Net amount awarded against IBM $ 78          
Individual Participants Of Defined Benefit Plans vs. IBM United Kingdom            
Loss Contingencies            
Claims pending | claim         290  
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    
Brazil Tax Matters            
Loss Contingencies            
Damages sought, value         $ 900  
Minimum            
Loss Contingencies            
Clients' presence in number of countries | country         175