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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 340
Due after one year through five years	2,276
Due after five years through ten years	377
Due after ten years	742
Amortized Cost	3,735	$ 3,208
Estimated Fair Value
Due in one year or less	338
Due after one year through five years	2,175
Due after five years through ten years	358
Due after ten years	696
Total	$ 3,567

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