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Pensions And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans Recognized In The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 5
Interest cost	1	3	7
Expected return on plan assets	0	0	0
Amortization of prior service cost	(25)	(20)	(1)
Recognized actuarial (gain) loss, net	(1)	(15)	9
Recognized settlement (gain) loss	0	0	(2)
Net periodic benefit (credit) cost	(24)	(31)	18
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	6	8
Interest cost	8	9	8
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Recognized actuarial (gain) loss, net	6	5	4
Recognized settlement (gain) loss	0	0	0
Net periodic benefit (credit) cost	25	20	20
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	8	10
Interest cost	57	65	78
Expected return on plan assets	(59)	(65)	(102)
Amortization of prior service cost	0	0	0
Recognized actuarial (gain) loss, net	1	2	2
Recognized settlement (gain) loss	2	(12)	8
Net periodic benefit (credit) cost	$ 3	$ (2)	$ (4)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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+ References

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-Publisher FASB
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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ References

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-Publisher FASB
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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

+ References

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-Name Accounting Standards Codification
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