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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Jun. 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	98
Due after five years through ten years, Amortized Cost	194
Due after ten years, Amortized Cost	85
Amortized Cost, Total	377
Due in one year or less, Fair Value	0
Due after one year through five years, Fair Value	104
Due after five years through ten years, Fair Value	208
Due after ten years, Fair Value	88
Fair Value, Total	$ 400

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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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