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Goodwill and Other Intangible Assets - Other Intangible Assets Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 96 $ 97
Future amortization expense, 2021 394  
Future amortization expense, 2022 390  
Future amortization expense, 2023 379  
Future amortization expense, 2024 368  
Future amortization expense, 2025 $ 344