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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Jun. 30, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 14
Due after one year through five years, Amortized Cost	114
Due after five years through ten years, Amortized Cost	180
Due after ten years, Amortized Cost	72
Amortized Cost, Total	380
Due in one year or less, Fair Value	14
Due after one year through five years, Fair Value	122
Due after five years through ten years, Fair Value	197
Due after ten years, Fair Value	77
Fair Value, Total	$ 410

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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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