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Investments - Held to Maturity Investments (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Amortized Cost |
Due in one year or less | $ 111
Due after one year through five years | 7
Debt Securities, Held-to-maturity | 118
Estimated Fair Value |
Due in one year or less | 111
Due after one year through five years | 7
Estimated Fair Value, Total | $ 118

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