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Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 86  
2020 115  
2021 114  
2022 114  
2023 113  
Thereafter 182  
Total $ 724 $ 453