Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Assets | ||
| Available-for-sale investment securities | $ 885 | $ 1,621 |
| Fair Value, Recurring | ||
| Assets | ||
| Cash equivalents | 1,758 | 1,921 |
| Restricted cash equivalents | 71 | 89 |
| Available-for-sale investment securities | 885 | 1,621 |
| Fair Value, Recurring | Level 1 | ||
| Assets | ||
| Cash equivalents | 1,758 | 1,921 |
| Restricted cash equivalents | 71 | 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 | 878 | 1,609 |
| Fair Value, Recurring | Level 3 | ||
| Assets | ||
| Cash equivalents | 0 | 0 |
| Restricted cash equivalents | 0 | 0 |
| Available-for-sale investment securities | $ 7 | $ 12 |
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- Definition Restricted Cash Equivalents, Fair Value Disclosure No definition available.
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- References No definition available.
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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