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INTANGIBLE ASSETS INCLUDING GOODWILL - Goodwill by Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in Goodwill Balances    
Beginning Balance $ 36,199 $ 32,021
Goodwill Additions 16 4,244
Purchase Price Adjustments (38) (7)
Divestitures (20) (18)
Foreign Currency Translation and Other Adjustments 631 (42)
Ending Balance 36,788 36,199
Goodwill impairment losses 0 0
Goodwill accumulated impairment losses 0 0
Cognitive Solutions    
Changes in Goodwill Balances    
Beginning Balance 19,484 15,621
Goodwill Additions 3 3,821
Purchase Price Adjustments (38) 5
Divestitures (20) (12)
Foreign Currency Translation and Other Adjustments 235 48
Ending Balance 19,665 19,484
Global Business Services    
Changes in Goodwill Balances    
Beginning Balance 4,607 4,396
Goodwill Additions   303
Purchase Price Adjustments 2 4
Divestitures   (1)
Foreign Currency Translation and Other Adjustments 204 (95)
Ending Balance 4,813 4,607
Technology Services & Cloud Platforms    
Changes in Goodwill Balances    
Beginning Balance 10,258 10,156
Goodwill Additions 13 119
Purchase Price Adjustments (2) (12)
Divestitures   (5)
Foreign Currency Translation and Other Adjustments 179 (1)
Ending Balance 10,447 10,258
Systems    
Changes in Goodwill Balances    
Beginning Balance 1,850 1,848
Purchase Price Adjustments 0 (4)
Foreign Currency Translation and Other Adjustments 13 5
Ending Balance $ 1,862 $ 1,850