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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, carrying value $ 1,352 $ 1,622
Long-term debt, fair value $ 1,356 $ 1,794