Investments (Narrative) (Details) $ in Millions	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Investments [Abstract]
Equity Securities, FV-NI and without Readily Determinable Fair Value	$ 4,200	$ 3,700
Equity Method Investments	$ 1,400	$ 1,500
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	37,000
Total number of security positions	41,000