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Segment Information 1 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment information        
Revenue $ 1,034 $ 1,018 $ 2,059 $ 2,017
Expenses 642 608 1,284 1,215
Segment profit $ 392 $ 410 $ 775 $ 802
Segment operating margin 38.00% 40.00% 38.00% 40.00%
Depreciation $ 17 $ 14 $ 33 $ 29
Reconciliation of segment profit to income before income taxes        
Segment profit 392 410 775 802
Share-based compensation expense 29 25 61 54
Other expenses, net [1] 4 2 12 2
Interest expense, net 24 14 49 29
Income before income taxes 258 306 496 583
Purchased Software Products        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 58 38 116 81
Other Intangible Assets        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 10 4 20 9
Internally Developed Software Products        
Reconciliation of segment profit to income before income taxes        
Amortization of intangible assets 9 21 21 44
Mainframe Solutions        
Segment information        
Revenue 539 550 1,075 1,101
Expenses 188 211 375 419
Segment profit $ 351 $ 339 $ 700 $ 682
Segment operating margin 65.00% 62.00% 65.00% 62.00%
Depreciation $ 10 $ 8 $ 19 $ 17
Reconciliation of segment profit to income before income taxes        
Segment profit 351 339 700 682
Enterprise Solutions        
Segment information        
Revenue 420 393 834 764
Expenses 380 324 761 648
Segment profit $ 40 $ 69 $ 73 $ 116
Segment operating margin 10.00% 18.00% 9.00% 15.00%
Depreciation $ 7 $ 6 $ 14 $ 12
Reconciliation of segment profit to income before income taxes        
Segment profit 40 69 73 116
Services        
Segment information        
Revenue 75 75 150 152
Expenses 74 73 148 148
Segment profit $ 1 $ 2 $ 2 $ 4
Segment operating margin 1.00% 3.00% 1.00% 3.00%
Depreciation $ 0 $ 0 $ 0 $ 0
Reconciliation of segment profit to income before income taxes        
Segment profit $ 1 $ 2 $ 2 $ 4
[1] Other expenses, net consists of costs associated with certain foreign exchange derivative hedging gains and losses, and other miscellaneous costs.