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Investments - Contractual Maturities of Available-for-Sale Investments (Details) $ in Millions	Jun. 30, 2021 USD ($)
Amortized Cost
Due in one year or less	$ 312
Due after one year through five years	1,200
Due after five years through ten years	264
Due after ten years	430
Amortized Cost	2,206
Estimated Fair Value
Due in one year or less	314
Due after one year through five years	1,225
Due after five years through ten years	267
Due after ten years	435
Estimated Fair Value	$ 2,241

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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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