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Condensed Consolidated Statements of Operations - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Net revenue:        
Net revenue: $ 1,576 $ 1,696 $ 2,899 $ 2,861
Cost of revenue:        
Amortization of acquired technology 14 6 21 12
Selling and marketing 580 593 942 976
Research and development 368 333 693 667
General and administrative 250 159 419 305
Amortization of other acquired intangible assets 36 1 38 3
Total costs and expenses 1,601 1,426 2,715 2,581
Operating income (loss) (25) 270 184 280
Interest expense (7) (3) (15) (5)
Interest and other income, net 54 15 63 29
Income before income taxes 22 282 232 304
Income tax provision 2 42 14 7
Net income $ 20 $ 240 $ 218 $ 297
Earnings Per Share, Basic        
Basic net income per share (in dollars per share) $ 0.07 $ 0.92 $ 0.82 $ 1.14
Shares used in basic per share calculations (in shares) 270,000,000 261,000,000 266,000,000 261,000,000
Earnings Per Share, Diluted        
Diluted net income per share (in dollars per share) $ 0.07 $ 0.91 $ 0.81 $ 1.13
Shares used in diluted per share calculations (in shares) 273,000,000 264,000,000 269,000,000 264,000,000
Dividends        
Cash dividends declared per common share (in dollars per share) $ 0.59 $ 0.53 $ 1.18 $ 1.06
Product        
Net revenue:        
Net revenue: $ 495 $ 545 $ 862 $ 898
Cost of revenue:        
Cost of revenue 22 24 37 41
Service and other        
Net revenue:        
Net revenue: 1,081 1,151 2,037 1,963
Cost of revenue:        
Cost of revenue $ 331 $ 310 $ 565 $ 577