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Segment Information 1 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Segment information        
Revenue $ 1,093 $ 1,007 $ 3,152 $ 3,024
Expenses 683 623 1,967 1,838
Segment profit (loss) $ 410 $ 384 $ 1,185 $ 1,186
Segment operating margin 38.00% 38.00% 38.00% 39.00%
Depreciation $ 15 $ 14 $ 48 $ 43
Reconciliation of segment profit to income before income taxes        
Segment profit 410 384 1,185 1,186
Share-based compensation expense 28 26 89 80
Other (gains) expenses, net (4) [1] (11) [1] 8 [2] (9) [1]
Interest expense, net 25 16 74 45
Income before income taxes 282 292 778 875
Purchased Software Products        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 60 39 176 120
Other Intangible Assets        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 11 4 31 13
Internally Developed Software Products        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 8 18 29 62
Mainframe Solutions        
Segment information        
Revenue 552 546 1,627 1,647
Expenses 197 215 572 634
Segment profit (loss) $ 355 $ 331 $ 1,055 $ 1,013
Segment operating margin 64.00% 61.00% 65.00% 62.00%
Depreciation $ 8 $ 8 $ 27 $ 25
Reconciliation of segment profit to income before income taxes        
Segment profit 355 331 1,055 1,013
Enterprise Solutions        
Segment information        
Revenue 461 389 1,295 1,153
Expenses 408 333 1,169 981
Segment profit (loss) $ 53 $ 56 $ 126 $ 172
Segment operating margin 11.00% 14.00% 10.00% 15.00%
Depreciation $ 7 $ 6 $ 21 $ 18
Reconciliation of segment profit to income before income taxes        
Segment profit 53 56 126 172
Services        
Segment information        
Revenue 80 72 230 224
Expenses 78 75 226 223
Segment profit (loss) $ 2 $ (3) $ 4 $ 1
Segment operating margin 3.00% (4.00%) 2.00% 0.00%
Depreciation $ 0 $ 0 $ 0 $ 0
Reconciliation of segment profit to income before income taxes        
Segment profit $ 2 $ (3) $ 4 $ 1
[1] Other gains, net consists of costs associated with certain foreign exchange derivative hedging gains and losses, and other miscellaneous costs.
[2] Other expenses, net consists of costs associated with certain foreign exchange derivative hedging gains and losses, and other miscellaneous costs.