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Supplemental Financial Information - Long-Term Investments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total | $ 818 | $ 799
Equity securities |  |
Summary of Investment Holdings [Line Items] |  |
Total | 547 | 555
Other |  |
Summary of Investment Holdings [Line Items] |  |
Total | $ 271 | $ 244

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