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Fair Value of Financial Instruments - Summary of Carrying And Fair Value Of Non-Variable Interest Rate Debt (Detail) - Senior Notes [Member] - Fair Value, Inputs, Level 2 [Member] - Non-Variable Interest Rate Debt [Member]
$ in Millions
Sep. 30, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Non-Variable Interest Rate Debt, Carrying Value $ 350
Non-Variable Interest Rate Debt, Fair Value $ 343