Pensions And Other Postretirement Benefits (Reconciliation Of Changes In Plans' Benefit Obligations, Assets And Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 1,512
Employer contributions	29	$ 53	$ 64
Fair value of plan assets at end of year	1,450	1,512
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	33	36
Service cost	1	1	1
Interest cost	1	1	3
Curtailment	0	0
Plan Amendments	0	0
Actuarial (gain) loss	(5)	(1)
Benefits paid	(2)	(4)
Benefit obligation at end of year	28	33	36
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	2	4
Benefits paid	(2)	(4)
Fair value of plan assets at end of year	0	0	0
Funded status	(28)	(33)
Funded Plan [Member] \| Qualified Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,477	1,554
Service cost	0	2	8
Interest cost	55	57	65
Curtailment	0	0
Plan Amendments	0	0
Actuarial (gain) loss	(60)	(52)
Benefits paid	(80)	(84)
Benefit obligation at end of year	1,392	1,477	1,554
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,512	1,440
Actual return on plan assets	4	115
Employer contributions	14	41
Benefits paid	(80)	(84)
Fair value of plan assets at end of year	1,450	1,512	1,440
Funded status	58	35
Unfunded Plan [Member] \| Nonqualified Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	230	222
Service cost	7	11	6
Interest cost	8	8	9
Curtailment	(5)	0
Plan Amendments	5	0
Actuarial (gain) loss	(10)	1
Benefits paid	(15)	(12)
Benefit obligation at end of year	220	230	222
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	15	12
Benefits paid	(15)	(12)
Fair value of plan assets at end of year	0	0	$ 0
Funded status	$ (220)	$ (230)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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