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Commitments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Guarantor Obligations [Line Items] |  |  |
Operating Leases, Rent Expense | $ 220 | $ 200 | $ 186
Lease, Maximum Initial Term | 7 years |  |
Cash Flow Assistance Program, Estimated Allowance For Uncollectible Receivables | $ 0 | 0 |
Guarantor Obligations, Current Carrying Value | 0 | 0 |
Potential maximum obligation under cash flow assistance program | 300 |  |
Total receivables under cash flow assistance program | 5 | $ 6 |
Industrial Revenue Bonds [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Asset | $ 698 |  |
Guarantee Obligations [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Period | 10 years |  |
Maximum potential amount | $ 14 |  |
Lease Residual Value Guarantees [Domain] |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum potential amount | $ 93 |  |
Maximum [Member] | Lease Residual Value Guarantees [Domain] |  |  |
Guarantor Obligations [Line Items] |  |  |
Lease, Maximum Initial Term | 10 years |  |

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