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Investments - Contractual Maturities of Available-for-Sale Investments (Details) $ in Millions	Sep. 30, 2021 USD ($)
Amortized Cost
Due in one year or less	$ 555
Due after one year through five years	1,530
Due after five years through ten years	296
Due after ten years	497
Amortized Cost	2,878
Estimated Fair Value
Due in one year or less	557
Due after one year through five years	1,546
Due after five years through ten years	298
Due after ten years	499
Estimated Fair Value	$ 2,900

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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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