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Supplemental Financial Information - Schedule of Components of Long-Term Investments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total | $ 951 | $ 886
Equity securities |  |
Summary of Investment Holdings [Line Items] |  |
Total | 633 | 553
Other |  |
Summary of Investment Holdings [Line Items] |  |
Total | $ 318 | $ 333

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