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Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Initial cost basis	$ 693
Upward adjustments	645
Downward adjustments (including impairment)	(198)
Measurement alternative	$ 1,140	$ 1,008

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