Investments - Schedule of Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due within one year	$ 2,238
Due in one year to five years	435
Due within five to ten years	22
Due beyond ten years	3
Total, Amortized Cost	2,698	$ 2,505
Estimated Fair Value
Due within one year	2,236
Due in one year to five years	422
Due within five to ten years	19
Due beyond ten years	3
Total, Estimated Fair Value	$ 2,680	$ 2,502