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Investments (Narrative) (Details)
$ in Billions
Dec. 31, 2021
USD ($)
positions
Dec. 31, 2020
USD ($)
Investment [Line Items]    
Equity Securities, FV-NI and without Readily Determinable Fair Value $ 3.5 $ 2.3
Equity Method Investments $ 1.3 $ 1.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions 13,000  
Total number of security positions 39,000