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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 286	$ 261
Cash and cash equivalents
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	79	60
U.S. Treasury notes
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	191	167
Corporate debt securities
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 16	$ 34

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This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

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