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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 114  
2021 116  
2022 116  
2023 114  
2024 80  
Thereafter 121  
Total $ 661 $ 453