Stockholders' Equity (Details) (USD $)	12 Months Ended
	Jul. 31, 2012		Jul. 31, 2011		Jul. 31, 2010		Aug. 31, 2012
Share-based Compensation [Abstract]
Share-based compensation expense	$ 169,000,000		$ 153,000,000		$ 135,000,000
Income tax benefit	(54,000,000)		(53,000,000)		(48,000,000)
Allocated share-based compensation expense, net of tax	115,000,000		100,000,000		87,000,000
Activity under all share-based compensation plans
Shares available for grant, Beginning Balance	30,716,000		8,761,000		8,086,000
Number of shares, Beginning Balance	22,679,000		32,593,000		45,674,000
Weighted average exercise price per share, Beginning Balance	$ 32.38		$ 28.45		$ 26.00
Shares available for grant, additional shares authorized			31,000,000		9,000,000
Options assumed and converted in connection with acquisitions	282,000				372,000
Weighted average exercise price per share, options assumed and converted in connection with acquisitions	54.51				3.08
Options granted, shares available for grant	(3,167,000)		(3,055,000)		(6,338,000)
Options granted, number of shares	3,167,000		3,055,000		6,338,000
Options granted, weighted average exercise price per share	$ 51.36		$ 47.70		$ 35.93
Restricted stock units granted, shares available for grant	(7,902,000)	[1]	(8,501,000)		(5,253,000)
Options exercised, number of shares	(7,513,000)		(11,997,000)		(17,212,000)
Options exercised, weighted average exercise price per share	$ 28.41		$ 25.68		$ 24.00
Options canceled or expired, shares available for grant	559,000	[2]	915,000	[2]	2,089,000	[2]
Options canceled or expired, number of shares	(554,000)	[2]	(972,000)	[2]	(2,579,000)	[2]
Options canceled or expired, weighted average exercise price per share	$ 39.43	[2]	$ 31.44	[2]	$ 29.46	[2]
Restricted stock units forfeited, shares available for grant	1,554,000	[1],[2]	1,596,000	[2]	1,177,000	[2]
Shares available for grant, Ending Balance	21,760,000		30,716,000		8,761,000
Number of shares, Ending Balance	18,061,000		22,679,000		32,593,000
Weighted average exercise price per share, Ending Balance	$ 37.49		$ 32.38		$ 28.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of shares (in thousands), options outstanding	18,061,000		22,679,000		32,593,000
Weighted average remaining contractual life (in years), options outstanding	4 years 10 months 28 days
Weighted average exercise price per share, options outstanding	$ 37.49		$ 32.38		$ 28.45
Aggregate intrinsic value (in millions), options outstanding	344,000,000
Number of shares (in thousands), options exercisable and expected to vest	17,443,000
Weighted average remaining contractual life (in years), options exercisable and expected to vest	4 years 9 months 20 days
Weighted average exercise price per share, options exercisable and expected to vest	$ 37.07
Aggregate intrinsic value (in millions), options exercisable and expected to vest	339,000,000
Number of shares (in thousands), options exercisable	10,926,000
Weighted average remaining contractual life (in years), options exercisable	3 years 5 months 11 days
Weighted average exercise price per share, options exercisable	$ 31.82
Aggregate intrinsic value (in millions), options exercisable	270,000,000
Additional information regarding stock options, restricted stock and ESPP
Weighted average fair value of options granted	$ 15.22		$ 10.44		$ 8.73
Total fair value of options vested	39,000,000		53,000,000		57,000,000
Aggregate intrinsic value of options exercised	202,000,000		261,000,000		157,000,000
Total tax benefit for stock option, restricted stock and ESPP share-based compensation	54,000,000		53,000,000		48,000,000
Cash received from option exercises	213,000,000		308,000,000		413,000,000
Cash tax benefits realized related to tax deductions for non-qualified option exercises and disqualifying dispositions under all share-based payment arrangements	72,000,000		99,000,000		61,000,000
Summary of restricted stock unit activity
Nonvested, Number of shares, Beginning Balance	11,055,000		11,531,000		9,398,000
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance	$ 37.92		$ 30.93		$ 27.06
Number of shares granted	3,436,000		3,855,000		5,253,000
Granted, Weighted Average Grant Date Fair Value	$ 55.02		$ 47.02		$ 36.24
Restricted stock units assumed and converted in connection with acquisitions, number of shares	575,000				231,000
Restricted stock units assumed and converted in connection with acquisitions, weighted average grant date fair value	$ 54.51				$ 29.14
Vested, Number of Shares	(4,763,000)		(3,474,000)		(2,172,000)
Vested, Weighted Average Grant Date Fair Value	$ 34.13		$ 26.33		$ 29.30
Forfeited, Number of Shares	(696,000)		(857,000)		(1,179,000)
Forfeited, Weighted Average Grant Date Fair Value	$ 39.56		$ 31.73		$ 26.46
Nonvested, Number of shares, Ending Balance	9,607,000		11,055,000		11,531,000
Nonvested, Weighted Average Grant Date Fair Value, Ending Balance	$ 46.79		$ 37.92		$ 30.93
Additional information regarding RSUs
Total tax benefit related to RSU share-based compensation expense	54,000,000		53,000,000		48,000,000
Stockholders' Equity (Textuals)
Common stock repurchased, value	900,000,000		1,360,000,000		900,000,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.60
Payments of Dividends	178,000,000		0		0
Dividend per share payable							$ 0.17
Common stock, shares authorized	750,000,000
Pool Shares Reduced For Each Share Granted	2.3
Pool Shares Increased For Each Share Forfeited	2.3
Percentage of lower of the closing price for stock on the first day last day of the offering period	85.00%
Shares issued during period for Employee Stock Purchase Plans	1,031,483		840,654		1,120,030
Shares available for issuance under Employee Stock Purchase Plan	4,749,188
Market price of common stock used to define in money options exercise price	$ 58.02
Treasury stock, shares	135,000,000
Sales Revenue, Goods, Net [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	0		1,000,000		1,000,000
Sales Revenue, Services, Net [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	7,000,000		6,000,000		7,000,000
Selling and Marketing Expense [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	60,000,000		46,000,000		41,000,000
Research and Development Expense [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	52,000,000		51,000,000		41,000,000
General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	50,000,000		49,000,000		44,000,000
Segment, Discontinued Operations [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	0		0		1,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average expected volatility	29.00%		28.00%		28.00%
Stockholders' Equity (Textuals)
Award vesting period	3 years
Number of years until options vest	7 years
Unrecognized compensation cost related to non-vested share based compensation expense	73,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years	2 years 3 months 15 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation [Abstract]
Income tax benefit	(39,000,000)		(36,000,000)		(25,000,000)
Additional information regarding stock options, restricted stock and ESPP
Share based compensation expense for stock options, restricted stock and ESPP	113,000,000		100,000,000		68,000,000
Total tax benefit for stock option, restricted stock and ESPP share-based compensation	39,000,000		36,000,000		25,000,000
Additional information regarding RSUs
Total fair value of RSUs vested	258,000,000		150,000,000		64,000,000
Share-based compensation for RSUs	113,000,000		100,000,000		68,000,000
Total tax benefit related to RSU share-based compensation expense	39,000,000		36,000,000		25,000,000
Actual tax benefits realized for tax deductions for restricted stock units	46,000,000		36,000,000		24,000,000
Stockholders' Equity (Textuals)
Award vesting period	3 years
Unrecognized compensation cost related to non-vested share based compensation expense	274,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years	2 years 5 months
Stock Options And Espp [Member]
Share-based Compensation [Abstract]
Income tax benefit	(15,000,000)		(17,000,000)		(24,000,000)
Additional information regarding stock options, restricted stock and ESPP
Share based compensation expense for stock options, restricted stock and ESPP	56,000,000		53,000,000		67,000,000
Total tax benefit for stock option, restricted stock and ESPP share-based compensation	15,000,000		17,000,000		24,000,000
Additional information regarding RSUs
Share-based compensation for RSUs	56,000,000		53,000,000		67,000,000
Total tax benefit related to RSU share-based compensation expense	15,000,000		17,000,000		24,000,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average expected volatility	29.00%		29.00%		26.00%
Stockholders' Equity (Textuals)
Common stock, shares authorized	20,800,000
Share Based Compensation Expense [Member]
Decrease in net income per share:
Basic	$ 0.39		$ 0.33		$ 0.28
Diluted	$ 0.38		$ 0.32		$ 0.27
Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility (range)	27.00%		27.00%		24.00%
Risk-free interest rate (range)	0.43%		0.87%		1.37%
Expected dividend yield	1.02%		0.00%		0.00%
Minimum [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility (range)	24.00%		27.00%		22.00%
Risk-free interest rate (range)	0.05%		0.05%		0.04%
Expected dividend yield	0.00%		0.00%		0.00%
Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility (range)	33.00%		30.00%		30.00%
Risk-free interest rate (range)	0.85%		1.91%		2.82%
Expected dividend yield	1.20%		1.20%		0.00%
Maximum [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility (range)	33.00%		33.00%		29.00%
Risk-free interest rate (range)	0.16%		0.16%		0.16%
Expected dividend yield	0.00%		0.00%		0.00%
Current Program [Member]
Stockholders' Equity (Textuals)
Common stock repurchased, value			1,400,000,000
Stock repurchase program remaining authorized repurchase amount	1,700,000,000
Restated 2005 Plan [Member]
Stockholders' Equity (Textuals)
Common stock, shares authorized	96,000,000
Common Stock [Member]
Stockholders' Equity (Textuals)
Common stock repurchased, share	16,864,000		28,234,000		28,745,000
Common stock repurchased, value

[1] Under the terms of our 2005 Equity Incentive Plan as amended on January 19, 2011, RSUs granted from the pool of shares available for grant on or after November 1, 2010 reduce the pool by 2.3 shares for each share granted. RSUs forfeited and returned to the pool of shares available for grant increase the pool by 2.3 shares for each share forfeited.

[2] Stock options and restricted stock units canceled, expired or forfeited under our 2005 Equity Incentive Plan are returned to the pool of shares available for grant. Stock options and restricted stock units canceled, expired or forfeited under older expired plans are not returned to the pool of shares available for grant.