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Segment and Geographic Information 1 (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Segment information      
Revenue $ 4,036 $ 4,025 $ 4,262
Income from continuing operations before interest and income taxes 1,135 1,135 1,162
Depreciation 58 62 71
Reconciliation of segment profit to income from continuing operations before income taxes      
Segment profit 1,135 1,135 1,162
Share-based compensation expense 108 97 87
Other (gains) expenses, net   (1) [1] 17 [2]
Interest expense, net 62 51 47
Income from continuing operations before income taxes 1,073 1,084 1,115
Purchased Software Products      
Reconciliation of segment profit to income from continuing operations before income taxes      
Amortization of intangible assets 164 146 124
Other Intangible Assets      
Reconciliation of segment profit to income from continuing operations before income taxes      
Amortization of intangible assets 19 44 58
Internally Developed Software Products      
Reconciliation of segment profit to income from continuing operations before income taxes      
Amortization of intangible assets 79 110 149
Mainframe Solutions      
Segment information      
Revenue 2,182 2,215 2,392
Expenses 851 854 970
Income from continuing operations before interest and income taxes $ 1,331 $ 1,361 $ 1,422
Segment operating margin 61.00% 61.00% 59.00%
Depreciation $ 34 $ 36 $ 43
Reconciliation of segment profit to income from continuing operations before income taxes      
Segment profit 1,331 1,361 1,422
Enterprise Solutions      
Segment information      
Revenue 1,553 1,484 1,519
Expenses 1,378 1,337 1,353
Income from continuing operations before interest and income taxes $ 175 $ 147 $ 166
Segment operating margin 11.00% 10.00% 11.00%
Depreciation $ 24 $ 26 $ 28
Reconciliation of segment profit to income from continuing operations before income taxes      
Segment profit 175 147 166
Services      
Segment information      
Revenue 301 326 351
Expenses 302 303 342
Income from continuing operations before interest and income taxes $ (1) $ 23 $ 9
Segment operating margin 0.00% 7.00% 3.00%
Depreciation $ 0 $ 0 $ 0
Reconciliation of segment profit to income from continuing operations before income taxes      
Segment profit (1) 23 9
Total Reportable Segments      
Segment information      
Revenue 4,036 4,025 4,262
Expenses 2,531 2,494 2,665
Income from continuing operations before interest and income taxes $ 1,505 $ 1,531 $ 1,597
Segment operating margin 37.00% 38.00% 37.00%
Depreciation $ 58 $ 62 $ 71
Reconciliation of segment profit to income from continuing operations before income taxes      
Segment profit $ 1,505 $ 1,531 $ 1,597
[1] Other gains, net consists of miscellaneous items.
[2] Other expenses, net consists of costs associated with the Fiscal Year 2014 Rebalancing Plan and other miscellaneous items.