Investments (Narrative) (Details) $ in Billions	Dec. 31, 2022 USD ($) positions	Dec. 31, 2021 USD ($)
Investments [Abstract]
Equity Securities, FV-NI and without Readily Determinable Fair Value	$ 3.7	$ 3.5
Equity Method Investments	$ 1.5	$ 1.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions	35,000
Total number of security positions	41,000