Stockholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015		Jan. 31, 2014	Feb. 28, 2015
Stockholders' Equity (Textuals)
Common stock repurchased (in shares)			7,500,000		20,200,000
Common stock repurchased, value			$ 668,000,000		$ 1,402,000,000
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)			$ 0.50
Payments of dividends			147,000,000		111,000,000
Dividends declared per common share (in dollars per share)	$ 0.25	$ 0.19	$ 0.50		$ 0.38
Total share-based compensation expense
Allocated Share-based Compensation Expense	61,000,000	52,000,000	122,000,000		99,000,000
Income tax benefit	(19,000,000)	(16,000,000)	(38,000,000)		(32,000,000)
Increase in net loss from continuing operations	42,000,000	36,000,000	84,000,000		67,000,000
Increase in net loss per share:
Basic (dollars per share)	$ 0.15	$ 0.13	$ 0.29		$ 0.23
Diluted (dollars per share)	$ 0.15	$ 0.13	$ 0.29		$ 0.23
Share-based awards available for grant
Shares Available for Grant, Beginning Balance (in shares)			24,203,000
Options granted (in shares)			0
Restricted stock units granted (in shares)			(1,117,000)	[1]
Share-based awards canceled/forfeited/expired (in shares)			2,262,000	[1],[2]
Shares Available for Grant, Ending Balance (in shares)	25,348,000		25,348,000
Pool Shares Reduced For Each Share Granted (in shares)			2.3
Pool Shares Increased For Each Share Forfeited (in shares)			2.3
Summary of stock option activity
Number of shares, Beginning Balance (in shares)			10,938,000
Options granted, number of shares (in shares)			0
Options exercised, number of shares (in shares)			(2,316,000)
Options canceled or expired, number of shares (in shares)			(383,000)
Number of shares, Ending Balance (in shares)	8,239,000		8,239,000
Exercisable (in shares)	4,360,000		4,360,000
Summary of stock option activity - weighted average exercise price
Weighted average exercise price per share, Beginning Balance (in dollars per share)			$ 52.67
Options granted, weighted average exercise price per share (in dollars per share)			$ 0.00
Options exercised, weighted average exercise price per share (in dollars per share)			$ 43.47
Options canceled or expired, weighted average exercise price per share (in dollars per share)			$ 64.32
Weighted average exercise price per share, Ending Balance (in dollars per share)	$ 54.72		$ 54.72
Exercisable, Weighted average exercise price per share (in dollars per share)	$ 41.95		$ 41.95
Summary of restricted stock unit activity
Nonvested at beginning of period (in shares)			9,455,000
Granted, Number of shares (in shares)			486,000
Restricted stock units assumed or granted in connection with acquisitions, Number of Shares (in shares)			212,000
Vested, Number of Shares (in shares)			(1,114,000)
Forfeited, Number of Shares (in shares)			(833,000)
Nonvested at end of period (in shares)	8,206,000		8,206,000
Summary of restricted stock unit activity - Weighted Average Grant Date Fair Value
Nonvested, Weighted Average Grant Date Fair Value, at beginning of period (in dollars per shares)			$ 62.46
Granted, Weighted Average Grant Date Fair Value (in dollars per shares)			$ 85.99
Restricted stock units assumed or granted in connection with acquisitions, Weighted Average Grant Date Fair Value (in dollars per share)			$ 92.64
Vested, Weighted Average Grant Date Fair Value (in dollars per shares)			$ 62.40
Forfeited, Weighted Average Grant Date Fair Value (in dollars per shares)			$ 58.70
Nonvested, Weighted Average Grant Date Fair Value, at end of period (in dollars per shares)	$ 65.02		$ 65.02
Stock Options [Member]
Summary of stock option activity - weighted average exercise price
Unrecognized compensation cost related to non-vested share based compensation expense	51,000,000		51,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years			2 years 2 months 1 day
Restricted Stock Units (RSUs) [Member]
Summary of stock option activity - weighted average exercise price
Unrecognized compensation cost related to non-vested share based compensation expense	333,000,000		333,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years			2 years 1 month 0 days
Cost of revenue [Member]
Total share-based compensation expense
Allocated Share-based Compensation Expense	2,000,000	2,000,000	4,000,000		4,000,000
Selling and marketing [Member]
Total share-based compensation expense
Allocated Share-based Compensation Expense	18,000,000	16,000,000	36,000,000		31,000,000
Research and development [Member]
Total share-based compensation expense
Allocated Share-based Compensation Expense	20,000,000	16,000,000	40,000,000		30,000,000
General and administrative [Member]
Total share-based compensation expense
Allocated Share-based Compensation Expense	21,000,000	18,000,000	42,000,000		34,000,000
New Program [Member]
Stockholders' Equity (Textuals)
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,200,000,000		$ 1,200,000,000
Dividend Declared [Member]
Stockholders' Equity (Textuals)
Dividends declared per common share (in dollars per share)						$ 0.25

[1] RSUs granted from the pool of shares available for grant under our 2005 Equity Incentive Plan 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.