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Acquisitions & Divestitures - Goodwill and Restricted Cash (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Acquisitions      
Goodwill $ 61,645 $ 59,617 $ 58,222
Turbonomic      
Acquisitions      
Weighted average useful life 6 years 10 months 24 days    
Goodwill $ 1,444    
Estimated percent of goodwill deductible for tax purposes 0.00%    
Other Acquisitions 2021      
Acquisitions      
Weighted average useful life 6 years 4 months 24 days    
Goodwill $ 833    
Estimated percent of goodwill deductible for tax purposes 10.00%    
Global Business Services | Turbonomic      
Acquisitions      
Goodwill $ 67    
Global Business Services | Other Acquisitions 2021      
Acquisitions      
Goodwill 549    
Cloud & Cognitive Software | Turbonomic      
Acquisitions      
Goodwill 1,377    
Cloud & Cognitive Software | Other Acquisitions 2021      
Acquisitions      
Goodwill 283    
Global Technology Services | Other Acquisitions 2021      
Acquisitions      
Goodwill $ 2