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Investments - Unrealized Gains and Losses on Equity Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments [Abstract]    
Net losses recognized during the period on equity investments $ (2) $ (246)
Less: Net gains recognized on equity investments sold during the period 2 0
Total unrealized losses on equity investments held, end of period $ (4) $ (246)