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Acquisitions/Divestitures - Businesses Acquired (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
entity
Jun. 30, 2017
USD ($)
entity
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
ACQUISITIONS        
Goodwill   $ 36,517 $ 36,199 $ 32,021
Technology Services & Cloud Platforms        
ACQUISITIONS        
Goodwill   10,365 10,258 10,156
Cognitive Solutions        
ACQUISITIONS        
Goodwill   $ 19,564 $ 19,484 $ 15,621
2017 Acquisitions        
ACQUISITIONS        
Businesses acquired, number (in entities) | entity   2    
Businesses acquired, aggregate cost   $ 17    
Percentage of business acquired (as a percent)   100.00%    
2017 Acquisitions | Technology Services & Cloud Platforms        
ACQUISITIONS        
Businesses acquired, number (in entities) | entity 1      
Goodwill   $ 5    
2017 Acquisitions | Cognitive Solutions        
ACQUISITIONS        
Goodwill   $ 3