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Fair Value Measurements - Summary of Fair Values of Outstanding TRS (Details) - Total Return Derivatives [Member] - Accounts Receivable [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total return swap assets $ 1 $ 0
Notional contract values $ 8 $ 0