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Debt - Summary of Current and Long-term Debt - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Debt Disclosure [Abstract]    
Total debt outstanding principal balance $ 1,726  
Discounts on outstanding debt balance 47  
Unamortized debt issuance expense, long-term debt 12 $ 21
Scheduled aggregate debt maturities by fiscal year [Abstract]    
2020 0  
2021 0  
2022 1,083  
2023 0  
2024 $ 0