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Defined Benefit Plan, Number of Plans

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Defined Benefit Plan, Number of Plans Subject to Settlement

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defined benefit plans with accumulated benefit obligations in excess of plan assets, number of plans

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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

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Amount of cost of providing special or contractual termination benefits payable from defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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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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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of cost for defined contribution plan.

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Amount of contributions made to multiemployer plan by employer.

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Pensions And Other Postretirement Benefits (Narrative) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 29, 2018 USD ($) plan	Apr. 01, 2017 plan	Sep. 26, 2020 USD ($)	Sep. 29, 2018 USD ($) plan	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution retirement programs, expenses recognized				$ 84	$ 78	$ 67
Multiemployer Plans, Pension [Member] \| Bakery and Confectionary Union & Industry International Pension Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, contributions				$ 2	$ 2	$ 1
Multiemployer Plans, Pension [Member] \| Bakery and Confectionary Union & Industry International Pension Fund [Member] \| Pension and Other Postretirement Plans, Contributions, Total [Member] \| Multiemployer Plans In Excess of 5% Concentration Risk [Member] [Domain]
Defined Benefit Plan Disclosure [Line Items]
Concentration, Percentage				5.00%
Multiemployer Plans, Pension [Member] \| Bakery and Confectionary Union & Industry International Pension Fund [Member] \| Pension and Other Postretirement Plans, Contributions, Total [Member] \| Multiemployer Plans Not In Excess of 5% Concentration Risk [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration, Percentage					5.00%	5.00%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				9
Number of defined benefit plans with accumulated benefit obligations in excess of plan assets				5	5
Defined Benefit Pension, Fair Value of Plan Assets				$ 1,450	$ 1,512
Expected contributions to pension plans for fiscal 2019				15
Defined benefit plans funding				$ 29	53	$ 64
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				5
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit)				$ (11)
Defined Benefit Plan, Benefit Obligation				28	33	36
Defined Benefit Pension, Fair Value of Plan Assets				0	0	0
Defined benefit plans funding				$ 2	4
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans \| plan				1
Defined Benefit Pension, Fair Value of Plan Assets				$ 30	28
Unfunded Plan [Member] \| Nonqualified Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				3
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit)				$ 3
Defined Benefit Plan, Benefit Obligation				220	230	222
Defined Benefit Pension, Fair Value of Plan Assets				0	0	0
Defined benefit plans funding				$ 15	12
Funded Plan [Member] \| Qualified Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				6
Accumulated benefit obligation				$ 1,392	1,477
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit)				(1)
Defined Benefit Plan, Benefit Obligation				1,392	1,477	1,554
Number of defined benefit plans \| plan		2
Defined Benefit Pension, Fair Value of Plan Assets				1,450	1,512	$ 1,440
Defined benefit plans funding				$ 14	$ 41
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				2
Defined Benefit Plan, Benefit Obligation				$ 17
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] \| Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				1
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] \| Postretirement Life Insurance [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				1
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates [Member] \| Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation				$ 10
Healthcare cost trend rate, assumed				7.60%
Healthcare cost trend rate, ultimate rate				4.50%
Other Postretirement Benefit Plan, Plan Amendments [Member] \| Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Plans \| plan				2
Other Postretirement Benefit Plan, Plan Amendments [Member] \| Maximum [Member] \| Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation				$ 1
Subsequent Event [Member] \| Funded Plan [Member] \| Qualified Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits	$ 21
Number of defined benefit plans \| plan	3
Subsequent Event [Member] \| Funded Plan [Member] \| Qualified Plan [Member] \| Minimum [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits			$ 35
Defined benefit plans funding			5
Subsequent Event [Member] \| Funded Plan [Member] \| Qualified Plan [Member] \| Maximum [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits			55
Defined benefit plans funding			$ 25