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Commitments and Contingencies - Future Payments Under Unconditional Purchase Obligations (Details)
$ in Millions
Sep. 29, 2018
USD ($)
Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 $ 2,447
2020 3,202
2021 1,749
2022 1,596
2023 268
Thereafter 66
Total $ 9,328