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Pensions And Other Postretirement Benefits (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 27, 2020 USD ($) | Mar. 28, 2020 USD ($) | Dec. 29, 2018 USD ($) plan | Apr. 01, 2017 plan | Oct. 03, 2020 USD ($) plan | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Terminated Plans | plan |  |  |  |  | 2 |  |
Defined contribution retirement programs, expenses recognized |  |  |  |  | $ 103 | $ 97 | $ 84
Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 6 |  |
Number of defined benefit plans with accumulated benefit obligations in excess of plan assets |  |  |  |  | 4 | 5 |
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits | $ 6 | $ 110 |  |  | $ 112 |  |
Expected contributions to pension plans for fiscal 2021 |  |  |  |  | 13 |  |
Defined benefit plans funding |  |  |  |  | $ 19 | $ 13 | 29
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 8 |  |
Assets for Plan Benefits, Defined Benefit Plan |  |  |  |  | $ 0 | 0 |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | 74 | 77 | 28
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 0 | 0 | 0
Defined benefit plans funding |  |  |  |  | $ 4 | 4 |
Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 5 |  |
Foreign Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of defined benefit plans | plan |  |  |  |  | 1 |  |
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | $ 32 |  |
Defined Benefit Plan, Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 4 |  |
Assets for Plan Benefits, Defined Benefit Plan |  |  |  |  | $ 0 | 0 |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | 238 | 239 | 220
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 0 | 0 | 0
Defined benefit plans funding |  |  |  |  | 12 | 12 |
Defined Benefit Plan, Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  |  |  |  | $ 4 | 16 |
Defined Benefit Plan, Number of Frozen and Noncontributory Plans | plan |  |  |  |  | 2 |  |
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits |  |  | $ 19 |  |  |  |
Accumulated benefit obligation |  |  |  |  | $ 31 | 1,478 |
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit) |  |  |  |  | 0 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | 31 | 1,478 | 1,392
Number of defined benefit plans | plan |  |  | 3 | 2 |  |  |
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 35 | 1,477 | $ 1,450
Defined benefit plans funding |  |  |  |  | 7 | 1 |
Pension Fund of Local 227 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation |  |  |  |  | 1 |  |
Hillshire Hourly and Salaried Plans [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  | $ 52 |  |  | 27 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 0 |  |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 2 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 16 |  |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Life Insurance [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plan, Plan Amendments [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plan, Plan Amendments [Member] | Maximum [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 1 |  |
Other Postretirement Benefit Plan, Hillshire and Keystone Plans [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 2 |  |
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Hillshire Plan [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 8 |  |
Healthcare cost trend rate, assumed |  |  |  |  | 7.00% |  |
Healthcare cost trend rate, ultimate rate |  |  |  |  | 4.50% |  |
Retail, Wholesale and Department Store International Union and Industry Pension Fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation |  |  |  |  | $ 10 | $ 15 |
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Keystone Plan [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 3 |  |
Healthcare cost trend rate, assumed |  |  |  |  | 6.80% |  |
Healthcare cost trend rate, ultimate rate |  |  |  |  | 5.00% |  |
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 7.00% | 36.00% |
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  |  | 61.00% |
Level 3 [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 93.00% | 3.00% |
Cash and Cash Equivalents [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 100.00% |  |

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