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Investments (Narrative) (Details)
$ in Millions
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Investments [Abstract]    
Equity Method Investments $ 1,700 $ 1,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 33,000  
Total number of security positions 40,000  
Equity Securities, FV-NI and without Readily Determinable Fair Value $ 3,400 $ 3,500