Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2010	Oct. 31, 2009	Jul. 31, 2011 Years percentage	Jul. 31, 2010	Jul. 31, 2009
Numerator:
Net income from continuing operations	$ (57)	$ 688	$ 73	$ (70)	$ (48)	$ 576	$ 80	$ (69)	$ 634	$ 539	$ 447
Net income from discontinued operations	0	0	0	0	0	0	34	1	0	35	0
Net income	(57)	688	73	(70)	(48)	576	114	(68)	634	574	447
Shares used in basic per share amounts:
Weighted average common shares outstanding									307	316	322
Shares used in diluted per share amounts:
Weighted average common shares outstanding									307	316	322
Dilutive common equivalent shares from stock options and restricted stock awards									10	9	8
Dilutive weighted average common shares outstanding									317	325	330
Basic and diluted net income per share:
Basic net income per share from continuing operations	$ (0.19)	$ 2.27	$ 0.24	$ (0.22)	$ (0.15)	$ 1.83	$ 0.25	$ (0.21)	$ 2.07	$ 1.71	$ 1.39
Basic net income per share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.11	$ 0.00	$ 0.00	$ 0.11	$ 0.00
Basic net income per share	$ (0.19)	$ 2.27	$ 0.24	$ (0.22)	$ (0.15)	$ 1.83	$ 0.36	$ (0.21)	$ 2.07	$ 1.82	$ 1.39
Diluted net income per share from continuing operations	$ (0.19)	$ 2.20	$ 0.23	$ (0.22)	$ (0.15)	$ 1.78	$ 0.25	$ (0.21)	$ 2	$ 1.66	$ 1.35
Diluted net income per share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.10	$ 0.00	$ 0.00	$ 0.11	$ 0.00
Diluted net income per share	$ (0.19)	$ 2.2	$ 0.23	$ (0.22)	$ (0.15)	$ 1.78	$ 0.35	$ (0.21)	$ 2	$ 1.77	$ 1.35
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect									0	8	24
Description of Business and Summary of Significant Accounting Policies (Textuals)
Average time for amortization of Software									three to five
Finite-Lived intangible assets, useful life, minimum									3
Finite-Lived intangible assets, useful life, maximum									5
Advertising expense									177	153	142
Estimated life of property and equipment									two to 30
Property, plant and equipment, useful life, minimum									2
Property, plant and equipment, useful life, maximum									30
Goodwill, impairment loss									24	0	0
Estimated life of purchased intangible assets									two to nine
Impairment of intangible assets, indefinite-lived (excluding goodwill)										$ 0	$ 0
Accounts Receivable [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Number of customers accounted for more than ten percent of concentration risk									0	0	0
Sales [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Number of customers accounted for more than ten percent of concentration risk									0	0	0
Minimum [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Acquired finite lived intangible asset useful life									2
Maximum [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Acquired finite lived intangible asset useful life									9