Consolidated Statements Of Operations (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Net revenue:      
Product $ 2,568 $ 2,134 $ 2,738
Service and other 1,947 1,441 1,059
Total net revenue 4,515 3,575 3,797
Cost of revenue:      
Product 1,028 1,032 1,085
Service and other 401 315 303
Total cost of revenue 1,429 1,347 1,388
Gross profit 3,086 2,228 2,409
Operating expenses:      
Research and development 1,094 1,125 1,153
Marketing and sales 647 680 788
General and administrative 386 410 354
Acquisition-related contingent consideration (3) (35) (64)
Amortization of intangibles 14 16 30
Restructuring and other charges 0 (1) 27
Total operating expenses 2,138 2,195 2,288
Operating income 948 33 121
Gains on strategic investments, net 0 0 39
Interest and other income (expense), net (23) (26) (21)
Income before provision for (benefit from) income taxes 925 7 139
Provision for (benefit from) income taxes 50 (1) 41
Net income $ 875 $ 8 $ 98
Net income per share:      
Basic $ 2.81 $ 0.03 $ 0.32
Diluted $ 2.69 $ 0.03 $ 0.31
Number of shares used in computation:      
Basic 311 308 310
Diluted 325 316 313