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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 466
Due after one year through five years	1,733
Due after five years through ten years	318
Due after ten years	577
Amortized Cost	3,094	$ 3,208
Estimated Fair Value
Due in one year or less	466
Due after one year through five years	1,668
Due after five years through ten years	306
Due after ten years	548
Total	$ 2,988

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