Stockholders' Equity (Details) (USD $)	0 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended	1 Months Ended
	Dec. 23, 2013	Aug. 23, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014		Jan. 31, 2013	Jan. 31, 2014 Stock Options [Member]	Jan. 31, 2014 Restricted Stock Units (RSUs) [Member]	Jan. 31, 2014 Cost of revenue [Member]	Jan. 31, 2013 Cost of revenue [Member]	Jan. 31, 2014 Cost of revenue [Member]	Jan. 31, 2013 Cost of revenue [Member]	Jan. 31, 2014 Selling and marketing [Member]	Jan. 31, 2013 Selling and marketing [Member]	Jan. 31, 2014 Selling and marketing [Member]	Jan. 31, 2013 Selling and marketing [Member]	Jan. 31, 2014 Research and development [Member]	Jan. 31, 2013 Research and development [Member]	Jan. 31, 2014 Research and development [Member]	Jan. 31, 2013 Research and development [Member]	Jan. 31, 2014 General and administrative [Member]	Jan. 31, 2013 General and administrative [Member]	Jan. 31, 2014 General and administrative [Member]	Jan. 31, 2013 General and administrative [Member]	Jan. 31, 2014 New Program [Member]	Feb. 28, 2014 Dividend Declared [Member]
Stockholders' Equity (Textuals)
Common stock repurchased, share	2,600,000				20,200,000		3,400,000
Common stock repurchased, value					$ 1,402,000,000		$ 200,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount																										2,000,000,000
Accelerated share repurchase program, amount to be repurchased		1,400,000,000
Initial amount paid under accelerated share repurchase agreement		(1,400,000,000)
Stock repurchased under the agreement		17,600,000
Common Stock, Dividends, Per Share, Cash Paid					$ 0.38
Payments of dividends					111,000,000		101,000,000
Dividends declared per common share			$ 0.19	$ 0.17	$ 0.38		$ 0.34																				$ 0.19
Total share-based compensation expense
Allocated Share-based Compensation Expense			52,000,000	44,000,000	99,000,000		90,000,000			2,000,000	1,000,000	4,000,000	3,000,000	16,000,000	16,000,000	31,000,000	32,000,000	16,000,000	13,000,000	30,000,000	26,000,000	18,000,000	14,000,000	34,000,000	29,000,000
Income tax benefit			(16,000,000)	(15,000,000)	(32,000,000)		(30,000,000)
Decrease in net income			36,000,000	29,000,000	67,000,000		60,000,000
Decrease in net income per share:
Basic (dollars per share)			$ 0.13	$ 0.10	$ 0.23		$ 0.20
Diluted (dollars per share)			$ 0.13	$ 0.10	$ 0.23		$ 0.20
Share based compensation expense for discontinued operations				3,000,000			6,000,000
Share-based awards available for grant
Shares Available for Grant, Beginning Balance					12,120,000
Additional shares authorized					19,000,000
Options granted					(28,000)
Restricted stock units granted					(1,436,000)	[1]
Share-based awards canceled/forfeited/expired					2,986,000	[1],[2]
Shares Available for Grant, Ending Balance			32,642,000		32,642,000
Pool Shares Reduced For Each Share Granted					2.3
Pool Shares Increased For Each Share Forfeited					2.3
Summary of stock option activity
Number of shares, Beginning Balance					14,206,000
Weighted average exercise price per share, Beginning Balance					$ 43.77
Options assumed and converted in connection with acquisitions, number of shares					17,000
Options assumed and converted in connection with acquisitions, weighted average exercise price					$ 13.61
Options granted, number of shares					28,000
Options granted, weighted average exercise price per share					$ 66.00
Options exercised, number of shares					(3,064,000)
Options exercised, weighted average exercise price per share					$ 38.12
Options canceled or expired, number of shares					(447,000)
Options canceled or expired, weighted average exercise price per share					$ 52.77
Number of shares, Ending Balance			10,740,000		10,740,000
Weighted average exercise price per share, Ending Balance			$ 45.02		$ 45.02
Exercisable			6,395,000		6,395,000
Weighted average exercise price per share, Exercisable			$ 36.38		$ 36.38
Summary of restricted stock unit activity
Nonvested at beginning of period					9,184,000
Nonvested, Weighted Average Grant Date Fair Value, at beginning of period					$ 55.23
Granted, Number of shares					624,000
Granted, Weighted Average Grant Date Fair Value					$ 69.82
Restricted stock units assumed or granted in connection with acquisitions, Number of shares					656,000
Restricted stock units assumed or granted in connection with acquisitions, Weighted Average Grant Date Fair Value					$ 69.48
Vested, Number of Shares					(784,000)
Vested, Weighted Average Grant Date Fair Value					$ 48.25
Forfeited, Number of Shares					(1,161,000)
Forfeited, Weighted Average Grant Date Fair Value					$ 63.65
Nonvested at end of period			8,519,000		8,519,000
Nonvested, Weighted Average Grant Date Fair Value, at end of period			$ 56.89		$ 56.89
Unrecognized compensation cost related to non-vested share based compensation expense								$ 42,000,000	$ 289,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years								2 years	2 years 2 months 12 days

[1] Under the terms of our Amended and Restated 2005 Equity Incentive Plan, as amended through July 24, 2012 (2005 Equity Incentive Plan), 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.