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Goodwill and Intangible Assets - Expected Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Expected Intangible Amortization    
2022 $ 233  
2023 202  
2024 162  
2025 156  
2026 140  
Thereafter 1,124  
Total net intangible assets subject to amortization $ 2,017 $ 1,653