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Postretirement Benefit Plans - Narrative (Details) - Pension - U.S. - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017 | Apr. 02, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary employer contributions | $ 302,000,000 | $ 700,000,000 | $ 700,000,000 |
Required employer contributions during the remainder of fiscal 2021 |  |  |  | $ 0

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