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Investments - Unrealized Gains and Losses on Equity Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments [Abstract]        
Net gains (losses) recognized during the period on equity investments $ (13) $ 19 $ (19) $ (166)
Less: Net gains (losses) recognized on equity investments sold during the period (4) 0 (2) 78
Total unrealized gains (losses) on equity investments held, end of period $ (9) $ 19 $ (17) $ (244)