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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

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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