Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 28, 2012	Sep. 30, 2011
Available-for-sale investments
Cost Basis	$ 200	$ 243
Gross Unrealized Gain	3	4
Consolidated Balance Sheets Classification - Prepaid and Other Current Assets	70	60
Consolidated Balance Sheets Classification - Other Assets	133	187
Due in one year or less - Cost Basis	69
Due in one year or less - Fair Value	70
Due after one year through five years - Cost Basis	131
Due after one year through five years - Fair Value	133
Level 1 | Recurring
Available-for-sale investments
Fair value	86	101
Level 2 | Recurring
Available-for-sale investments
Fair value	117	146
Total | Recurring
Available-for-sale investments
Fair value	203	247
Corporate debt securities
Available-for-sale investments
Cost Basis	33	43
Gross Unrealized Gain	1
Consolidated Balance Sheets Classification - Prepaid and Other Current Assets	7	11
Consolidated Balance Sheets Classification - Other Assets	27	32
Corporate debt securities | Level 2 | Recurring
Available-for-sale investments
Fair value	34	43
Corporate debt securities | Total | Recurring
Available-for-sale investments
Fair value	34	43
U.S. Government debt securities
Available-for-sale investments
Cost Basis	167	200
Gross Unrealized Gain	2	4
Consolidated Balance Sheets Classification - Prepaid and Other Current Assets	63	49
Consolidated Balance Sheets Classification - Other Assets	106	155
U.S. Government debt securities | Level 1 | Recurring
Available-for-sale investments
Fair value	86	101
U.S. Government debt securities | Level 2 | Recurring
Available-for-sale investments
Fair value	83	103
U.S. Government debt securities | Total | Recurring
Available-for-sale investments
Fair value	$ 169	$ 204