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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 313
Due after one year through five years	2,421
Due after five years through ten years	428
Due after ten years	917
Amortized Cost	4,079	$ 3,709
Estimated Fair Value
Due in one year or less	307
Due after one year through five years	2,311
Due after five years through ten years	415
Due after ten years	853
Total	$ 3,886

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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), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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-Section 50
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+ References

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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