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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 12
Due after one year through five years, Amortized Cost	76
Due after five years through ten years, Amortized Cost	183
Due after ten years, Amortized Cost	66
Amortized Cost, Total	337
Due in one year or less, Fair Value	12
Due after one year through five years, Fair Value	79
Due after five years through ten years, Fair Value	195
Due after ten years, Fair Value	70
Fair Value, Total	$ 356

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