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Goodwill and Other Intangible Assets - Other Intangible Assets Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 104 $ 96
Future amortization expense, 2022 418  
Future amortization expense, 2023 411  
Future amortization expense, 2024 396  
Future amortization expense, 2025 375  
Future amortization expense, 2026 $ 299