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Goodwill and Intangible Assets - Expected Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Expected Intangible Amortization    
2021 $ 192  
2022 189  
2023 152  
2024 118  
2025 111  
Thereafter 891  
Total net intangible assets subject to amortization $ 1,653 $ 1,723