X0306 4 2021-06-08 false 0000051143 INTERNATIONAL BUSINESS MACHINES CORP IBM 0001695828 Del Bene Robert F IBM CORPORATION ONE NEW ORCHARD ROAD ARMONK NY 10504 false true false false VP, Controller Common Stock 2021-06-08 4 M false 858.00 0.00 A 13676.817 D Common Stock 2021-06-08 4 F false 435.00 149.16 D 13241.817 D Common Stock 2021-06-08 4 M false 937.00 0.00 A 14178.817 D Common Stock 2021-06-08 4 F false 499.00 149.16 D 13679.817 D Common Stock 2021-06-08 4 M false 1623.00 0.00 A 15302.817 D Common Stock 2021-06-08 4 F false 864.00 149.16 D 14438.817 D Rst. Stock Unit 0.00 2021-06-08 4 A false 5538.00 0.00 A Common Stock 5538.00 5538.00 D Rst. Stock Unit 0.00 2021-06-08 4 M false 858.00 0.00 D Common Stock 858.00 0.00 D Rst. Stock Unit 0.00 2021-06-08 4 M false 937.00 0.00 D Common Stock 937.00 939.00 D Rst. Stock Unit 0.00 2021-06-08 4 M false 1623.00 0.00 D Common Stock 1623.00 4872.00 D Upon lapse of the restrictions, these units are payable in cash or the company's common stock. The restrictions lapse for 1,384 of these units on June 8, 2022, 1,384 of these units on June 8, 2023, 1,384 of these units on June 8, 2024, and 1,386 of these units on June 8, 2025. These units were payable in cash or the company's common stock upon the lapse of the restrictions on the transaction date shown. Release of restricted stock units. D. Condrea on behalf of R. F. Del Bene 2021-06-09