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Pensions And Other Postretirement Benefits (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 29, 2018
plan
Oct. 02, 2021
USD ($)
plan
Oct. 03, 2020
USD ($)
Sep. 28, 2019
USD ($)
Apr. 03, 2021
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Defined contribution retirement programs, expenses recognized   $ 106 $ 103 $ 97  
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Number of Plans | plan   4      
Number of defined benefit plans with accumulated benefit obligations in excess of plan assets   3 4    
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits   $ 112      
Expected contributions to pension plans for fiscal 2021   14      
Defined benefit plans funding   15 $ 19 13  
Defined Benefit Plan, Plan Amendment [Abstract]          
Multiemployer Plan, Employer Contribution, Cost   $ 1 1    
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   65 74 77  
Defined Benefit Pension, Fair Value of Plan Assets   0 0 0  
Defined benefit plans funding   3 4    
Defined Benefit Plan, Plan Amendment [Abstract]          
Plan Amendments   (8) (6)    
Defined Benefit Plan, Gain from Plan Amendment   $ 34      
Postretirement Health Coverage [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Number of Plans | plan   5      
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   3      
Assets for Plan Benefits, Defined Benefit Plan   $ 0 0    
Defined Benefit Plan, Benefit Obligation   220 238 239  
Defined Benefit Pension, Fair Value of Plan Assets   0 0 0  
Defined benefit plans funding   14 12    
Defined Benefit Plan, Plan Amendment [Abstract]          
Plan Amendments   0 0    
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   5 4    
Accumulated benefit obligation   28 31    
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit)   0      
Defined Benefit Plan, Benefit Obligation   28 31 1,478  
Number of defined benefit plans | plan 3        
Defined Benefit Pension, Fair Value of Plan Assets   33 35 $ 1,477  
Defined benefit plans funding   $ 1 7    
Defined Benefit Plan, Plan Amendment [Abstract]          
Defined Benefit Plan, Number of Frozen and Noncontributory Plans | plan   1      
Plan Amendments   $ 0 $ 0    
Defined Benefit Plan, Number of Frozen and Noncontributory Plans | plan   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
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   $ 14      
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   $ 1      
Healthcare cost trend rate, assumed   6.60%      
Healthcare cost trend rate, ultimate rate   4.50%      
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   $ 4      
Healthcare cost trend rate, assumed   6.30%      
Healthcare cost trend rate, ultimate rate   4.50%