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Segments - Results of Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Information      
Revenue $ 17,571 $ 18,182 $ 77,000
Pre-tax income from continuing operations (49) 1,883  
External Revenue      
Segment Information      
Revenue 17,508 17,731  
External Revenue | Cloud & Cognitive Software      
Segment Information      
Revenue 5,238 4,967  
External Revenue | Global Business Services      
Segment Information      
Revenue 4,136 4,155  
External Revenue | Global Technology Services      
Segment Information      
Revenue 6,467 6,875  
External Revenue | Systems      
Segment Information      
Revenue 1,368 1,328  
External Revenue | Global Financing      
Segment Information      
Revenue 299 406  
Internal transactions      
Segment Information      
Revenue (1,514) (1,668)  
Pre-tax income from continuing operations (55) (89)  
Internal transactions | Cloud & Cognitive Software      
Segment Information      
Revenue (813) (841)  
Internal transactions | Global Business Services      
Segment Information      
Revenue (46) (74)  
Internal transactions | Global Technology Services      
Segment Information      
Revenue (294) (290)  
Internal transactions | Systems      
Segment Information      
Revenue (148) (163)  
Internal transactions | Global Financing      
Segment Information      
Revenue (212) (300)  
Business Segments      
Segment Information      
Revenue 19,023 19,398  
Pre-tax income from continuing operations $ 1,003 $ 2,445  
Revenue year-to-year change (as a percent) (1.90%)    
Pre-tax income year-to-year change (as a percent) (59.00%)    
Pre-tax income margin (as a percent) 5.30% 12.60%  
Business Segments | Cloud & Cognitive Software      
Segment Information      
Revenue $ 6,052 $ 5,808  
Pre-tax income from continuing operations $ 933 $ 1,785  
Revenue year-to-year change (as a percent) 4.20%    
Pre-tax income year-to-year change (as a percent) (47.70%)    
Pre-tax income margin (as a percent) 15.40% 30.70%  
Business Segments | Global Business Services      
Segment Information      
Revenue $ 4,183 $ 4,229  
Pre-tax income from continuing operations $ 271 $ 298  
Revenue year-to-year change (as a percent) (1.10%)    
Pre-tax income year-to-year change (as a percent) (9.10%)    
Pre-tax income margin (as a percent) 6.50% 7.00%  
Business Segments | Global Technology Services      
Segment Information      
Revenue $ 6,761 $ 7,164  
Pre-tax income from continuing operations $ (178) $ 275  
Revenue year-to-year change (as a percent) (5.60%)    
Pre-tax income year-to-year change (as a percent) (164.70%)    
Pre-tax income margin (as a percent) (2.60%) 3.80%  
Business Segments | Systems      
Segment Information      
Revenue $ 1,516 $ 1,491  
Pre-tax income from continuing operations $ (217) $ (202)  
Revenue year-to-year change (as a percent) 1.70%    
Pre-tax income year-to-year change (as a percent) 7.60%    
Pre-tax income margin (as a percent) (14.30%) (13.50%)  
Business Segments | Global Financing      
Segment Information      
Revenue $ 511 $ 706  
Pre-tax income from continuing operations $ 194 $ 288  
Revenue year-to-year change (as a percent) (27.60%)    
Pre-tax income year-to-year change (as a percent) (32.70%)    
Pre-tax income margin (as a percent) 37.90% 40.80%  
Adjustment      
Segment Information      
Revenue     $ 300