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Commitments - Unconditional Purchase Obligations (Details)
$ in Millions
Oct. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Unconditional purchase obligations $ 1,208
Fiscal year  
2018 728
2019 289
2020 116
2021 52
2022 21
Thereafter 2
Total $ 1,208