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Investments (Narrative) (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Investments [Abstract]    
Equity Securities, FV-NI and without Readily Determinable Fair Value $ 4,900 $ 4,900
Equity Method Investments $ 1,800 $ 1,400
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 27,000  
Total number of security positions 41,000