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RETIREMENT-RELATED BENEFITS - Contributions and Direct Benefit Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Total $ 229 $ 225 $ 236
Percentage of contribution 6.00%    
Employees joined on or after September 1, 2021      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of contribution 3.00%    
Defined benefit plans      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 25 4 4
Multi-employer plans      
Defined Benefit Plan Disclosure [Line Items]      
Total 5 7 9
Defined contribution plans      
Defined Benefit Plan Disclosure [Line Items]      
Total 165 194 207
Direct payments      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 33 $ 19 $ 16
IBM 401(k) Plus Plan      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of contribution 6.00%    
Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Estimated cash contributions to the defined benefit plans in next fiscal year $ 29