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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 378
Due after one year through five years	2,330
Due after five years through ten years	390
Due after ten years	784
Amortized Cost	3,882	$ 3,208
Estimated Fair Value
Due in one year or less	374
Due after one year through five years	2,186
Due after five years through ten years	364
Due after ten years	715
Total	$ 3,639

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