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Investments (Narrative) (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Investments [Abstract]    
Equity Securities, FV-NI and without Readily Determinable Fair Value $ 4,100 $ 4,900
Equity Method Investments $ 1,400 $ 1,400
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 32,000  
Total number of security positions 39,000