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Investments (Narrative) (Details)
$ in Billions
Dec. 31, 2023
USD ($)
positions
Dec. 31, 2022
USD ($)
Investments [Abstract]    
Equity Securities, FV-NI and without Readily Determinable Fair Value $ 4.9 $ 3.7
Equity Method Investments $ 1.4 $ 1.5
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions 30,000  
Total number of security positions 40,000