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Fair Value Measurements - Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 6,647 $ 6,665
Estimated fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 6,238 $ 6,189