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Investments of Insurance Subsidiaries - Schedule of Maturities of Investments (Detail) $ in Millions	Mar. 31, 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	64
Due after five years through ten years, Amortized Cost	201
Due after ten years, Amortized Cost	68
Amortized Cost, Total	336
Due in one year or less, Fair Value	3
Due after one year through five years, Fair Value	65
Due after five years through ten years, Fair Value	209
Due after ten years, Fair Value	70
Fair Value, Total	$ 347

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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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