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Pensions And Other Postretirement Benefits (Reconciliation Of Changes In Plans' Benefit Obligations, Assets And Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Sep. 27, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance $ 1,576    
Employer contributions 64 $ 14 $ 9
Ending balance 1,440 1,576  
Funded Qualified Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 1,785 1,849  
Service cost 8 10 1
Interest cost 65 78 10
Plan Amendments 0 0  
Plan participants' contributions 0 0  
Actuarial (gain) loss 21 (50)  
Benefits paid (339) (102)  
Defined Benefit Plan, Other Changes 14 0  
Benefit obligation at end of year 1,554 1,785 1,849
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 1,576 1,647  
Actual return on plan assets 135 25  
Employer contributions 54 6  
Plan participants' contributions 0 0  
Benefits paid (339) (102)  
Other 14 0  
Ending balance 1,440 1,576 1,647
Funded status (114) (209)  
Unfunded Non-Qualified Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 201 182  
Service cost 6 8 7
Interest cost 9 8 5
Plan Amendments 0 0  
Plan participants' contributions 0 0  
Actuarial (gain) loss 16 11  
Benefits paid (10) (8)  
Defined Benefit Plan, Other Changes 0 0  
Benefit obligation at end of year 222 201 182
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 0 3  
Actual return on plan assets 0 0  
Employer contributions 10 8  
Plan participants' contributions 0 0  
Benefits paid (10) (8)  
Other 0 (3)  
Ending balance 0 0 3
Funded status (222) (201)  
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 114 163  
Service cost 1 5 2
Interest cost 3 7 3
Plan Amendments (58) (60)  
Plan participants' contributions 1 2  
Actuarial (gain) loss (15) 9  
Benefits paid (10) (12)  
Defined Benefit Plan, Other Changes 0 0  
Benefit obligation at end of year 36 114 163
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 0 0  
Actual return on plan assets 0 0  
Employer contributions 9 10  
Plan participants' contributions 1 2  
Benefits paid (10) (12)  
Other 0 0  
Ending balance 0 0 $ 0
Funded status $ (36) $ (114)