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Pensions And Other Postretirement Benefits Pensions and Other Postretirement Benefits (Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Millions	Sep. 28, 2019	Sep. 29, 2018
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 27	$ 0
Prior service (credit) cost	(42)	(49)
Total accumulated other comprehensive (income)/loss	(15)	(49)
Qualified Plan [Member] | Funded Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	(53)	(96)
Prior service (credit) cost	0	0
Total accumulated other comprehensive (income)/loss	(53)	(96)
Nonqualified Plan [Member] | Unfunded Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	46	31
Prior service (credit) cost	4	5
Total accumulated other comprehensive (income)/loss	$ 50	$ 36

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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