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Acquisitions/Divestitures (Details)
$ / shares in Units, $ in Billions
3 Months Ended 9 Months Ended
Jul. 09, 2019
USD ($)
$ / shares
Sep. 30, 2020
item
Jun. 30, 2020
item
Mar. 31, 2020
item
Sep. 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 1 3