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Acquisitions & Divestitures, Businesses Acquired, 2019 (Details)
$ / shares in Units, $ in Billions
12 Months Ended
Jul. 09, 2019
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
entity
Acquisitions    
Percentage of business acquired (as a percent)   100.00%
2019 Acquisitions    
Acquisitions    
Number of acquisitions | entity   1
Aggregate acquisitions cost   $ 35
Red Hat, Inc.    
Acquisitions    
Cash paid to acquiree shareholders (in dollars per share) | $ / shares $ 190  
Aggregate acquisitions cost $ 34