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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions | Sep. 30, 2018 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Due in one year or less, Amortized Cost | $ 9
Due after one year through five years, Amortized Cost | 57
Due after five years through ten years, Amortized Cost | 210
Due after ten years, Amortized Cost | 67
Amortized Cost, Total | 343
Due in one year or less, Fair Value | 9
Due after one year through five years, Fair Value | 58
Due after five years through ten years, Fair Value | 212
Due after ten years, Fair Value | 66
Fair Value, Total | $ 345

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