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Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Allowance for Doubtful Accounts [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 19 | $ 34 | $ 33
Charged to Costs and Expenses | 4 | 3 | 10
Charged to Other Accounts | 0 | 0 | 0
(Deductions) | (2) | (18) | (9)
Balance at End of Period | 21 | 19 | 34
Inventory Lower of Cost or Market Allowance [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 25 | 3 | 39
Charged to Costs and Expenses | 61 | 68 | 5
Charged to Other Accounts | 0 | 0 | 0
(Deductions) | (52) | (46) | (41)
Balance at End of Period | 34 | 25 | 3
Valuation Allowance on Deferred Tax Assets [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 79 | 75 | 72
Charged to Costs and Expenses | 13 | 12 | 4
Charged to Other Accounts | 6 | 0 | 0
(Deductions) | (12) | (8) | (1)
Balance at End of Period | $ 86 | $ 79 | $ 75

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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