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Acquisitions/Divestitures - Businesses Acquired, 2018 (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
entity
2018 Acquisitions    
Business Acquisition [Line Items]    
Number of acquisitions   2
Aggregate acquisitions cost | $   $ 49
Percentage of business acquired (as a percent)   100.00%
2018 Acquisitions | Cognitive Solutions    
Business Acquisition [Line Items]    
Number of acquisitions   1
2018 Acquisitions | Global Business Services    
Business Acquisition [Line Items]    
Number of acquisitions   1
Red Hat, Inc. | Expected    
Business Acquisition [Line Items]    
Aggregate acquisitions cost | $ $ 34,000  
Percentage of business acquired (as a percent) 100.00%  
Cash to be paid to acquiree shareholders (in dollars per share) | $ / shares $ 190