Subsequent Event (Details) - Pension Plan - Subsequent Event $ in Millions		3 Months Ended
Oct. 09, 2020 USD ($) Benefit_Plan_Participants	Dec. 27, 2020 USD ($)
Subsequent Event [Line Items]
Pension obligation	$ 235
Number of retirees and beneficiaries (in participants) \| Benefit_Plan_Participants	1,850
Minimum \| Forecast
Subsequent Event [Line Items]
Curtailment recorded		$ (80)
Maximum \| Forecast
Subsequent Event [Line Items]
Curtailment recorded		$ (85)

Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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