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Intangibles - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Jul. 31, 2018
Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 20  
2019 81  
2020 81  
2021 80  
2022 79  
Thereafter 132  
Total $ 473 $ 3