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Investments - Equity Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments [Abstract]    
Equity investments without readily determinable fair values $ 798 $ 1,011
Equity investments under the equity method of accounting 54 65
Equity investments under the fair value option 51 54
Total equity investments $ 903 $ 1,130