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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 0
Due after one year through five years, Amortized Cost	134
Due after five years through ten years, Amortized Cost	177
Due after ten years, Amortized Cost	80
Amortized Cost, Total	391
Due in one year or less, Fair Value	0
Due after one year through five years, Fair Value	141
Due after five years through ten years, Fair Value	187
Due after ten years, Fair Value	83
Fair Value, Total	$ 411

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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