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Acquisitions/Divestitures (Details)
$ / shares in Units, $ in Billions
3 Months Ended 6 Months Ended
Jul. 09, 2019
USD ($)
$ / shares
Jun. 30, 2020
item
Mar. 31, 2020
item
Jun. 30, 2020
item
Acquisitions        
Percentage of business acquired (as a percent)   100.00%   100.00%
Red Hat, Inc.        
Acquisitions        
Percentage of business acquired (as a percent) 100.00%      
Cash paid to acquiree shareholders (in dollars per share) | $ / shares $ 190      
Aggregate acquisitions cost $ 35      
Businesses acquired, cash consideration $ 34      
Cloud & Cognitive Software        
Acquisitions        
Number of acquisitions | item   1 1 2