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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
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 36 $ 114  
Service cost 1 1 $ 5
Interest cost 1 3 7
Plan Amendments 0 (58)  
Plan participants' contributions 0 1  
Actuarial (gain) loss (1) (15)  
Benefits paid 4 10  
Other 0 0  
Benefit obligation at end of year 33 36 114
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 4 9  
Plan participants' contributions 0 1  
Benefits paid (4) (10)  
Other 0 0  
Ending balance 0 0 0
Funded status (33) (36)  
Pension Plan [Member]      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 1,440    
Employer contributions 53 64 14
Ending balance 1,512 1,440  
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 222 201  
Service cost 11 6 8
Interest cost 8 9 8
Plan Amendments 0 0  
Plan participants' contributions 0 0  
Actuarial (gain) loss 1 16  
Benefits paid 12 10  
Other 0 0  
Benefit obligation at end of year 230 222 201
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 12 10  
Plan participants' contributions 0 0  
Benefits paid (12) (10)  
Other 0 0  
Ending balance 0 0 0
Funded status (230) (222)  
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 1,554 1,785  
Service cost 2 8 10
Interest cost 57 65 78
Plan Amendments 0 0  
Plan participants' contributions 0 0  
Actuarial (gain) loss (52) 21  
Benefits paid 84 339  
Other 0 14  
Benefit obligation at end of year 1,477 1,554 1,785
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 1,440 1,576  
Actual return on plan assets 115 135  
Employer contributions 41 54  
Plan participants' contributions 0 0  
Benefits paid (84) (339)  
Other 0 14  
Ending balance 1,512 1,440 $ 1,576
Funded status $ 35 $ (114)