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Acquisitions/Divestitures - Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jul. 09, 2019
Dec. 31, 2018
Acquisitions        
Goodwill $ 57,517 $ 58,222   $ 36,265
Expected percent of goodwill deductible for tax purposes 7.00%      
Red Hat, Inc.        
Acquisitions        
Goodwill $ 23,100   $ 23,137  
Cloud & Cognitive Software | Red Hat, Inc.        
Acquisitions        
Goodwill 18,500      
Global Technology Services | Red Hat, Inc.        
Acquisitions        
Goodwill 3,100      
Global Business Services | Red Hat, Inc.        
Acquisitions        
Goodwill 1,100      
Systems | Red Hat, Inc.        
Acquisitions        
Goodwill $ 400