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Investments Short-term and Long-term investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Short-term Investments | $ 12 | $ 14
Equity Method Investments | 84 | 74
Long-term investments | 90 | 435
Restricted Cash Equivalents |  | $ 96
Restricted Cash Equivalents, Statement of Financial Position [Extensible Enumeration] |  | Long-term investments
Short-term Investments [Member] |  |
Marketable Securities [Line Items] |  |
Equity Securities, FV-NI, Current | 11 | $ 11
Debt Securities, Held-to-maturity, Current | 0 | 3
Debt Securities, Time Deposits | 1 | 0
Long-term investments [Member] |  |
Marketable Securities [Line Items] |  |
Equity Method Investments | 90 | 80
Restricted Investments | $ 0 | $ 355

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