v3.26.1
Employee Benefit Plan, Related-Party and Party-in-Interest Transactions (Details) - EBP 001 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
EBP, Investment, Number of Shares  
Total investments at fair value $ 57,471,593 $ 52,878,411
IBM Corporation common stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
EBP, Investment, Number of Shares 5,313,300 5,769,852
EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Purchase Price $ 104,000  
EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price 233,000  
Total investments at fair value $ 1,574,000 $ 1,268,000