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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 3
Due after one year through five years, Amortized Cost	74
Due after five years through ten years, Amortized Cost	192
Due after ten years, Amortized Cost	65
Amortized Cost, Total	334
Due in one year or less, Fair Value	3
Due after one year through five years, Fair Value	77
Due after five years through ten years, Fair Value	203
Due after ten years, Fair Value	68
Fair Value, Total	$ 351

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