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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Available-for-sale investment securities	$ 1,145	$ 1,621
Fair Value, Recurring
Assets
Cash equivalents	2,018	1,921
Restricted cash equivalents	70	89
Available-for-sale investment securities	1,145	1,621
Fair Value, Recurring | Level 1
Assets
Cash equivalents	2,018	1,921
Restricted cash equivalents	70	89
Available-for-sale investment securities	0	0
Fair Value, Recurring | Level 2
Assets
Cash equivalents	0	0
Restricted cash equivalents	0	0
Available-for-sale investment securities	1,136	1,609
Fair Value, Recurring | Level 3
Assets
Cash equivalents	0	0
Restricted cash equivalents	0	0
Available-for-sale investment securities	$ 9	$ 12

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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