Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011 Years percentage segments	Jul. 31, 2010	Jul. 31, 2009
Current:
Federal	$ 268	$ 231	$ 160
State	43	44	7
Foreign	5	33	12
Total current	316	308	179
Deferred:
Federal	3	(15)	24
State	7	(1)	7
Foreign	6	(16)	(4)
Total deferred provision for income taxes from continuing operations	16	(32)	27
Total provision for income taxes from continuing operations	332	276	206
Income Statement [Abstract]
United States	919	779	627
Foreign	47	36	26
Total	966	815	653
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income from continuing operations before income taxes	966	815	653
Statutory federal income tax	338	285	229
State income tax, net of federal benefit	33	27	9
Federal research and experimentation credits	(25)	(8)	(20)
Domestic production activities deduction	(25)	(14)	(11)
Share-based compensation	6	4	4
Tax exempt interest	(1)	(2)	(5)
Effects of non-U.S. operations	(4)	(20)	0
Goodwill impairment	8	0	0
Other, net	2	4	0
Total provision for income taxes from continuing operations	332	276	206
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals [Abstract]
Accruals and reserves not currently deductible	28	30
Deferred rent	9	10
Accrued and deferred compensation	33	18
Loss and tax credit carryforwards	39	63
Property and equipment	11	8
Share-based compensation	88	89
Other, net	1	4
Total deferred tax assets	209	222
Deferred tax liabilities:
Intangible assets	51	55
Other, net	1	1
Total deferred tax liabilities	52	56
Total net deferred tax assets	157	166
Valuation allowance	(8)	(8)
Total net deferred tax assets, net of valuation allowance	149	158
Current deferred income taxes	94	117
Long-term deferred income taxes	55	41
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benfits, beginning balance	35	40	45
Increases related to tax positions from prior fiscal years, including acquisitions	2	3	10
Decreases related to tax positions from prior fiscal years	0	(5)	(10)
Increases related to tax positions taken during current fiscal year	4	3	4
Settlements with tax authorities	0	0	(8)
Lapses of statutes of limitations	0	(6)	(1)
Gross unrecognized tax benfits, ending balance	41	35	40
Income Taxes (Textuals)
Income tax effects allocated directly to equity, employee stock options	81	36	18
Federal statutory income tax rate	35.00%
Discrete tax benefit due to changes in federal tax law	9		7
Income tax reconciliation, tax settlements, state and local			18
Earnings from foreign subsidiaries intended to be indefinitely reinvested	30
Deferred tax liabilities, undistributed foreign earnings	8
Unrecognized tax benefits net of related deferred tax assets	35
Operating loss carryforwards, expiration dates	2021
Favourable net impact to income tax expense due to recognition of tax benefits	35
Excess foreign tax credits	15
Federal foreign tax credits carried back	2
Deferred tax assets, operating loss carryforwards, foreign	13
Deferred tax assets, net	9
Operating loss carryforwards, valuation allowance	8
Domestic Country [Member]
Income Taxes (Textuals)
Operating loss carryforwards	35
State and Local Jurisdiction [Member]
Income Taxes (Textuals)
Operating loss carryforwards	$ 168