Income Taxes Components of Income Tax (Details) (USD $) In Millions	12 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 27, 2009
Current provision [Abstract]
Federal	$ 179	$ 1,514	$ 268
State	57	242	71
Foreign	670	389	291
Total current provision	906	2,145	630
Deferred provision [Abstract]
Federal	170	(1,139)	(72)
State	62	(26)	72
Foreign	(6)	(7)	(19)
Total deferred provision	226	(1,172)	(19)
Income tax provision	1,132	973	611
Components of Income Before Income Taxes [Abstract]
United States	2,984	2,195	1,368
Foreign	2,703	2,298	1,035
Income from continuing operations before income taxes	5,687	4,493	2,403
Reconciliation of the Expected Statutory Federal Income Tax Provision to Actual Income Tax Provision [Abstract]
Expected income tax provision at federal statutory tax rate	1,991	1,573	841
State income tax provision, net of federal benefit	283	226	113
Foreign income taxed at other than U.S. rates	(1,074)	(897)	(407)
Tax audit impacts, net	1	3	(155)
Tax credits	(151)	(55)	(112)
Valuation allowance	42	(40)	227
Revaluation of deferred taxes	69	152	74
Other	(29)	11	30
Income tax provision	1,132	973	611
Deferred Tax Assets and Deferred Tax Liabilities [Abstract]
Accrued liabilities, reserves and other	205	287
Share-based compensation	592	615
Capitalized start-up and organizational costs	91	102
Unearned revenues	1,269	1,311
Unrealized losses on marketable securities	309	341
Unrealized losses on other investments	28	27
Capital loss carryover	40	37
Tax credits	145	54
Unused net operating losses	97	64
Other basis differences	30	10
Total gross deferred assets	2,806	2,848
Valuation allowance	(98)	(39)
Total net deferred assets	2,708	2,809
Purchased intangible assets	(174)	(108)
Deferred contract costs	(7)	(6)
Unrealized gains on marketable securities	(206)	(352)
Property, plant and equipment	(85)	(100)
Total deferred liabilities	472	566
Net deferred assets	2,236	2,243
Reported as [Abstract]
Current deferred tax assets	537	321
Non-current deferred tax assets	1,703	1,922
Current deferred tax liabilities	(2)	0
Non-current deferred tax liabilities	(2)	0
Net deferred assets	$ 2,236	$ 2,243