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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2014 U.S. Treasury and Agency [Member] | Sep. 28, 2013 U.S. Treasury and Agency [Member] | Mar. 29, 2014 Corporate And Asset-Backed [Member] | Sep. 28, 2013 Corporate And Asset-Backed [Member] | Mar. 29, 2014 Common Stock and Warrants [Member] | Sep. 28, 2013 Common Stock and Warrants [Member] | Mar. 29, 2014 Level 1 [Member] | Mar. 29, 2014 Level 2 [Member] | Mar. 29, 2014 Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Other-than-Temporary Impairment Loss |  |  |  |  | $ 6 |  |  |  |
Short Term Investment Maturity Period |  |  |  |  |  |  |  |  | 12 months
Available For Sale Securities Debt Maturity Period |  |  |  |  |  |  |  |  | 35 years
Unrealized Gain/(Loss) | 0 | 0 | 1 | 1 | 0 | (5) |  |  |
Number of shares of Syntroleum Corporation acquired |  |  |  |  |  |  | 0.8 |  |
Shares able to be purchased through warrants |  |  |  |  |  |  |  | 0.4 |
Exercise price of warrants, per share |  |  |  |  |  |  |  | 28.70 |
Amortized Cost Basis | 26 | 25 | 66 | 64 | 3 | 9 |  |  |
Fair Value | $ 26 | $ 25 | $ 67 | $ 65 | $ 3 | $ 4 |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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