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Pension and Other Benefit Programs - Estimated Future Benefit Payments (Detail)
$ in Millions
Sep. 29, 2018
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 534
2020 544
2021 579
2022 618
2023 656
2024 - 2028 3,827
Postretirement Medical Plans  
Defined Benefit Plan Disclosure [Line Items]  
2019 51 [1]
2020 54 [1]
2021 58 [1]
2022 63 [1]
2023 68 [1]
2024 - 2028 $ 404 [1]
[1] Estimated future benefit payments are net of expected Medicare subsidy receipts of $80 million.